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Our lab diamond grading report review explains what a certificate confirms, what it misses, and how to compare diamonds clearly before you buy online.
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A lab diamond comparison should not begin with a sales pitch or a single price per carat. It should begin with the ring you want to wear every day. Two laboratory-grown diamonds can share the same shape, carat weight and grading on paper, yet look noticeably different once they are placed in the same setting. The right choice is the one that balances beauty, quality, budget and the story you want the piece to carry.
Lab-grown diamonds are real diamonds. They have the same carbon crystal structure as mined diamonds, and they are assessed using familiar measures such as cut, colour, clarity and carat weight. Their origin is different: they are grown in a controlled environment rather than formed underground over geological time. That difference can create valuable flexibility in your budget, particularly if size or a higher-quality cut matters to you.
Start Your Lab Diamond Comparison With Cut
Cut is the quality factor that has the greatest effect on sparkle. It determines how light enters the diamond, moves through it and returns to your eye. A well-cut diamond can look lively and bright even when it is not the highest colour or clarity grade. A poorly cut stone can look dull, dark in the centre or larger on paper than it feels on the hand.
For round brilliant diamonds, look beyond the word “excellent” alone. A grading report is useful, but proportions, symmetry and the diamond's actual light performance still matter. For fancy shapes such as oval, pear, emerald, radiant and cushion, cut grades are less standardised. This is where viewing the individual stone becomes especially valuable.
An oval may have a noticeable bow-tie shadow across its middle. A radiant may show strong contrast that some people love and others find too dark. An emerald cut will reveal its clean, stepped facets, which means clarity and precision are easier to see than in a brilliant-cut diamond. There is no universal winner. The aim is to select a stone whose pattern and personality suit you.
Colour and Clarity: Choose What You Can Actually See
Colour grades run from colourless through to warmer tones. In a laboratory-grown diamond, many shoppers find that a near-colourless range offers an excellent balance of appearance and value, especially in white gold or platinum. Yellow gold and rose gold can also make a slightly warmer diamond look intentional and beautiful.
The setting changes the decision. A solitaire exposes more of the diamond, so colour is easier to notice from the side. In a halo or three-stone design, matching the centre stone and side stones matters just as much as chasing the highest grade. If the ring is designed in yellow gold with a white-metal setting around the diamond, a jeweller can help you assess how those tones will work together before manufacturing begins.
Clarity describes internal characteristics, known as inclusions, and surface features, called blemishes. The goal is usually eye-clean, not technically flawless. If you cannot see an inclusion without magnification in normal viewing conditions, paying significantly more to remove it from a report may not improve the ring you wear.
That said, placement matters. An inclusion near the edge of a diamond can sometimes be concealed by a claw, while one directly under the table may be more visible. Inclusions can also matter structurally in rare cases, particularly if they reach a vulnerable point of a fancy-shaped stone. This is why a clear video, photographs and expert review are more useful than choosing a clarity grade in isolation.
Carat Weight Is Not the Same as Visual Size
Carat measures weight, not face-up size. A 1.50-carat diamond with a deep cut can appear smaller than another 1.50-carat diamond cut to broader proportions. Shape has a major influence too. Ovals, marquise and pear shapes often look larger for their weight than round diamonds, while a deep cushion or princess cut may look more compact.
Rather than beginning with a fixed carat target, consider the finger coverage you prefer and the setting style you have in mind. A fine solitaire band can make the centre diamond feel more prominent. A bezel offers a sleek, protective outline but covers a little more of the stone's edge. Three-stone rings create width and visual presence without putting the entire budget into one centre diamond.
A thoughtful design can often achieve more than simply increasing carat weight. That is especially true for an engagement ring, where comfort, durability and proportion matter long after the proposal.
Certification Gives You a Baseline, Not the Whole Answer
An independent diamond grading report gives you a consistent reference point for the stone's stated characteristics. It should identify the diamond as laboratory-grown and record details such as its measurements, carat weight, colour, clarity and any growth treatment disclosed by the laboratory.
Certification is essential for transparency, but it is not a substitute for looking at the diamond itself. Reports cannot fully communicate brightness, contrast, fluorescence effects, bow-ties, transparency or whether the stone appeals to your eye. They also cannot tell you how the diamond will sit in your chosen ring design.
Ask to see the certificate alongside clear imagery of the individual stone. If you are selecting remotely, request practical guidance rather than a generic claim that every diamond is “perfect”. A jeweller should be able to explain what they see, where the trade-offs are and why one option may suit your design better than another.
Compare Like for Like on Price
Laboratory-grown diamonds can cost less than comparable mined diamonds, but broad price claims are not enough. Compare stones with similar shape, carat weight, cut quality, colour, clarity, certification and measurements. A lower price may reflect a genuine saving, or it may reflect a difference in make, transparency, grading characteristics or supplier service.
The ring itself also needs to be part of the comparison. A centre stone set into a thin, mass-produced mount is not equivalent to a diamond selected for a handcrafted setting with considered proportions, secure stone setting and finishing work. The metal, band thickness, claw design and quality of the side stones all affect the finished piece.
Manufacturer-direct pricing gives you a clearer view of where your investment is going. At TJ Gold & Diamond, the design, CAD modelling, manufacture, setting and polishing are handled through our in-house workshop, so the conversation can stay focused on the diamond and ring you actually want - not a retail markup or a commission target.
Think About Origin With Honest Nuance
Some buyers choose a lab-grown diamond because they want an alternative to mined origin. That is a valid preference, but “lab-grown” is not a complete sustainability assessment by itself. Growing diamonds uses energy, and the environmental impact varies according to the production method and energy sources used by the producer.
If origin is central to your decision, ask for available sourcing information and choose a jeweller who is open about what can and cannot be verified. The same principle applies to precious metals. Recycled metal, traceable sourcing and local manufacture may all be part of the conversation, depending on your priorities.
A diamond's meaning is personal. For some couples, the appeal is the ability to choose a larger stone within a set budget. For others, it is the modern production method, or simply the freedom to spend more on a custom setting, wedding bands or the next chapter they are building together.
Match the Diamond to the Way You Live
A beautiful diamond still needs a setting that works for real life. If you work with your hands, play sport regularly or prefer a low-profile ring, a bezel, semi-bezel or lower-set solitaire may be a better fit than tall, delicate claws. If maximum light and a classic look are your priority, a carefully made claw setting can be ideal, provided it is built with appropriate strength.
This is also where bespoke design earns its place. CAD allows you to consider band width, profile, setting height and diamond orientation before the ring is made. Small adjustments can make a significant difference to comfort and how confidently the ring wears over time.
The most useful lab diamond comparison is not the one with the longest spreadsheet. It is the one that leaves you clear on what you value, able to see the individual stone and confident that the finished ring will be made to suit your life. Bring your ideas, questions and budget to the conversation. A good jeweller will help you turn them into a piece that feels unmistakably yours.
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Quick answer: TJ Diamond handcrafts princess cut diamond engagement rings in Auckland in 18ct gold and platinum, with GIA or IGI certification on every stone. Try before you pay policy. Virtual consultation available. From $999 NZD. Princess cut diamonds are consistently 20 to 30% less expensive than round brilliants at the same quality grades.
The princess cut is the second most popular diamond shape in New Zealand, behind only the round brilliant. Its geometric square outline, high sparkle output, and price advantage over round diamonds make it the most practical choice for NZ buyers who want maximum diamond presence without compromising on brilliance. If you are searching for a princess cut diamond ring in New Zealand, this guide covers what to look for, where to buy, and what to avoid.
Why Princess Cut Diamonds Are 20 to 30% Less Expensive in NZ
The price difference between a princess cut and a round brilliant diamond is not a quality gap. It is an engineering efficiency built into the shape at the point of cutting.
Round brilliant diamonds waste up to 60% of the original rough crystal during cutting. The round outline discards a significant proportion of the octahedral diamond rough. Princess cut diamonds solve this problem: the shape maps closely to the natural octahedral geometry of diamond rough, meaning two princess cuts can often be produced from one crystal with minimal waste. Less waste means lower raw material cost, which means a lower retail price at equivalent quality grades.
A 1 carat princess cut diamond in G colour, VS2 clarity will cost 20 to 30% less than a 1 carat round brilliant at the same grades. That saving is real and consistent across the NZ market. It represents the manufacturing efficiency of the shape, not a compromise in sparkle or quality.
For the full technical explanation of the princess cut's facet system, chevron patterns, and V-prong requirements, see our article what is a princess cut diamond?.
The One Technical Detail Every NZ Buyer Must Know: V-Prong Settings
The princess cut has four sharp 90-degree corners. Those corners are the most structurally vulnerable points on the diamond. A direct impact concentrates force at the single sharp corner edge, which is susceptible to chipping without proper protection.
The solution is a V-shaped prong at each corner. A V-prong cradles the corner on both sides, distributing any impact across the prong surface rather than the diamond edge. Standard round prongs leave the corner partially exposed. Any princess cut ring without V-prongs at all four corners is an improperly set stone.
TJ Diamond uses V-prongs at all four corners of every princess cut ring as standard, across every setting style in our collection. When comparing princess cut rings from any NZ jeweller, confirm V-prong corner protection before purchasing.
The Chevron Facet Pattern — What No Certificate Tells You
Princess cut diamonds are produced with different numbers of chevron facets on the pavilion (the underside of the stone). This detail affects the visual character of the sparkle but does not appear on any GIA or IGI certificate.
Two chevron patterns: Larger, more defined facets producing bold, high-contrast flashes similar to a round brilliant. The most classic princess cut character.
Three chevron patterns: An intermediate balance between bold and intricate sparkle. Suits buyers who want variety in the light pattern.
Four chevron patterns: The smallest, most numerous facets producing intricate scintillating sparkle that is the most distinctively princess cut visual character of the three options.
All three chevron configurations perform well in terms of sparkle output. The difference is aesthetic, not qualitative. The chevron pattern must be assessed in person or in a virtual consultation, as product photography under direct overhead lighting does not show the distinction accurately. TJ Diamond holds princess cut diamonds with different chevron counts in our Auckland studio for direct comparison.
Princess Cut Ring Settings — What Works Best in NZ
Princess cut solitaire engagement rings in 18ct yellow gold or platinum: the most classic configuration. Four-prong setting with V-prongs at every corner. Four-prong settings allow maximum light entry into the stone from all angles, producing the fullest brilliance the cut can deliver.
Princess cut with halo setting: a ring of round accent diamonds surrounding the princess cut centre creates a strong visual contrast between the geometric square outline and the circular halo. The halo amplifies the perceived size of the centre stone by 0.25 to 0.50 carats, making a 0.80 carat princess cut read comparably to a 1.25 carat solitaire.
Three-stone princess cut: a princess cut centre flanked by two smaller round or princess side stones. The horizontal composition suits a wide range of finger proportions.
Princess cut with pavé band: a princess cut centre on a pavé-set diamond band adds sparkle to the overall ring while the geometric centre stone remains the clear visual focus.
Browse the full princess cut diamond rings collection for anniversary, self-purchase, and fashion styles alongside engagement ring options.
18ct Gold vs Other Metals for Princess Cut Rings in NZ
Most NZ online jewellers sell princess cut rings in 9ct gold or do not clearly state the gold carat in their product listings. TJ Diamond uses 18ct gold (75% pure gold) as the standard for every princess cut ring. The difference matters:
18ct yellow gold with a princess cut: The warm yellow gold and the square diamond create a classic, rich combination. The yellow gold provides a colour grade advantage: H or I colour princess cut diamonds appear as colourless as D or E colour stones in white metal settings. This allows NZ buyers to select one to two colour grades lower with no visible difference, saving $800 to $2,500 NZD at the 1 carat level.
18ct rose gold with a princess cut: A contemporary and increasingly popular combination. The blush warmth of rose gold against the geometric square outline of the princess cut creates a distinctive contrast. The same colour grade advantage as yellow gold applies.
Platinum with a princess cut: The most durable setting for daily wear. Platinum work-hardens rather than eroding, keeping the V-prong corner protection secure over decades. Recommended for buyers who want a white metal setting with maximum long-term prong security. G colour minimum for platinum settings.
Natural vs Lab-Grown Princess Cut Diamonds in NZ
TJ Diamond offers both natural and lab-grown princess cut diamonds with GIA or IGI certification at equivalent quality grades. Lab-grown princess cuts are available at 50 to 70% below natural equivalents. A $4,000 NZD budget achieves a lab-grown princess cut stone size and quality that would cost $10,000 NZD or more in natural diamond at NZ retail prices. The lab-grown option makes the higher carat weights and better clarity grades more accessible for NZ buyers working within a defined budget.
What TJ Diamond Offers NZ Princess Cut Buyers
Handcrafted in Auckland: every ring is made to order in our Auckland studio in 18ct gold or platinum. Not imported from overseas stock.
GIA or IGI certification: every princess cut diamond carries a verifiable certificate. Report number provided before purchase so you can verify grades independently.
V-prong corner protection: standard on every TJ Diamond princess cut ring across all setting styles.
Chevron pattern assessment: princess cut diamonds with different chevron counts available for comparison in our Auckland studio and in virtual consultations.
Try before you pay: the completed ring is delivered to you for in-person inspection before the payment is finalised.
Every TJ Diamond ring is covered by our lifetime warranty covering prong maintenance, professional re-polishing, stone resetting, and resizing for the life of the ring. V-prong maintenance is specifically included, given the importance of corner protection for princess cut diamonds.
Browse our princess cut engagement ring collection and see every available configuration in 18ct gold and platinum. Or
contact our Auckland team to book a virtual consultation. We show you the specific diamond, compare chevron patterns side by side, and confirm the V-prong setting quality before any commitment is made.
Frequently Asked Questions
Q1: Where can I buy a princess cut diamond ring in NZ?
TJ Diamond is New Zealand's specialist for princess cut diamond engagement rings, handcrafted in our Auckland studio in 18ct gold and platinum. Every princess cut diamond comes with a GIA or IGI certificate. You can browse the collection online and book a virtual consultation to see the specific stone before committing. Our try before you pay policy means the ring is delivered to you for in-person inspection before the payment is finalised. Princess cut rings start from $999 NZD at TJ Diamond.
Q2: What is a princess cut diamond ring?
A princess cut diamond ring features a square diamond with four sharp 90-degree corners and a brilliant-cut facet system that produces high sparkle output in a geometric square outline. The princess cut was created in 1979 by Betzalel Ambar and Israel Itzkowitz, making it one of the newest major diamond cuts in regular production. It is the second most popular diamond shape in New Zealand after the round brilliant. The four corners are the shape's most structurally vulnerable points and require V-shaped prong protection at each corner to prevent chipping over daily wear.
Q3: Are princess cut diamond rings more expensive than round brilliant rings in NZ?
No. Princess cut diamond rings are typically 20 to 30% less expensive than equivalent round brilliant rings at the same carat weight and quality grades in New Zealand. The price advantage comes from the way princess cuts are produced: two princess cut diamonds can often be cut from one octahedral diamond crystal with minimal waste, whereas a round brilliant wastes up to 60% of the rough crystal. TJ Diamond passes this manufacturing efficiency directly to the buyer. A 1 carat princess cut at G colour, VS2 clarity in 18ct gold costs meaningfully less than the same specification in a round brilliant.
Q4: What are V-prong settings and why do princess cut rings need them?
V-prongs are setting prongs shaped like a V rather than a round claw, designed specifically to cradle the sharp 90-degree corners of princess cut and other square or rectangular diamonds. The four corners of a princess cut diamond are its most structurally vulnerable points. A direct impact concentrates force at the single sharp corner edge, which is susceptible to chipping or cracking without protective coverage. A V-prong cradles each corner on both sides, distributing any impact force across the prong surface rather than the diamond edge. Standard round prongs leave the corner partially exposed. TJ Diamond sets every princess cut ring with V-prongs at all four corners as standard.
Q5: What is the chevron facet pattern in a princess cut diamond?
The chevron pattern refers to the number of V-shaped chevron facets on the pavilion (underside) of a princess cut diamond. Two chevron configurations produce bold, high-contrast flashes of light similar in character to a round brilliant. Three chevron configurations produce an intermediate balance. Four chevron configurations produce smaller, more numerous sparkle points and the most distinctively princess cut visual character. The chevron count is not disclosed on any GIA or IGI certificate and cannot be assessed from product photographs. It must be seen in person or in a virtual consultation. TJ Diamond holds princess cut diamonds with different chevron counts in our Auckland studio for direct comparison.
Q6: What colour grade should I choose for a princess cut diamond ring in NZ?
For a platinum or white gold princess cut ring, G colour is the recommended minimum for a consistently colourless appearance. For an 18ct yellow gold or rose gold setting, H or I colour princess cut diamonds appear as colourless as D or E colour stones in white metal, because the warm metal absorbs and neutralises the diamond's own warmth. Selecting H colour instead of F colour in a yellow gold princess cut ring saves typically $800 to $2,500 NZD at the 1 carat level with no visible difference in the finished ring. The princess cut's brilliant facet system is more forgiving of colour than step-cut shapes like the emerald or Asscher, making it a practical choice across the G through I colour range.
Q7: What settings work best for princess cut diamond rings?
Princess cut diamonds suit a range of settings. A four-prong solitaire with V-prongs at each corner is the most classic and most widely chosen configuration. A cathedral solitaire raises the centre stone for more visibility. A halo of round accent diamonds contrasts the geometric square outline of the princess cut with circular sparkle, amplifying the perceived size of the centre stone by 0.25 to 0.50 carats. A three-stone setting with two smaller princess or round side stones creates a strong horizontal composition. A pavé band adds sparkle to the overall ring without competing with the centre stone. The bezel setting is not commonly used for princess cuts as it covers the corners, concealing the shape's characteristic square outline.
Q8: How much does a princess cut diamond ring cost in NZ?
Princess cut diamond engagement rings at TJ Diamond start from $999 NZD. A 1 carat princess cut in G colour, VS2 clarity, GIA or IGI certified, in an 18ct yellow gold solitaire setting typically ranges from $3,500 to $7,500 NZD depending on the specific stone grades. Princess cuts are consistently 20 to 30% less expensive than round brilliants at equivalent grades, making them one of the best value diamond shapes available. Lab-grown princess cut diamonds carry the same GIA or IGI certification at 50 to 70% below natural equivalents, so a $4,000 NZD lab-grown princess cut budget achieves a stone size and quality that would cost $10,000 NZD or more in natural at retail.
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Our platinum gold comparison explains colour, strength, weight, care and value so you can choose the right metal for an engagement ring or wedding band.
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