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A practical lab diamond comparison for choosing cut, colour, clarity, certification and a setting that suits your budget and everyday life with confidence.
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A diamond report can look reassuringly technical, full of measurements, plotting diagrams and grades. But a lab diamond grading report review should do more than confirm that paperwork exists. It should help you understand whether the diamond in front of you is the one described, whether its quality suits the setting you want, and whether the price makes sense for its actual appearance.
For an engagement ring, the report is one part of a much more personal decision. A beautifully proportioned lab-grown diamond with strong light performance can look exceptional in a simple solitaire. A higher-grade stone with poor proportions or an unattractive tint may not. The goal is not to buy the most impressive line of text on a certificate. It is to choose a diamond you will love seeing every day.
What a lab diamond grading report actually tells you
An independent grading report records the characteristics of a specific loose diamond at the time it was examined. Most reports identify whether the diamond is laboratory-grown and describe the growth method, typically CVD or HPHT. They also record the familiar 4Cs: cut, colour, clarity and carat weight.
The report should include the diamond's shape, precise measurements, proportions, fluorescence where assessed, polish and symmetry. It will usually carry a unique report number, often laser-inscribed on the diamond's girdle. This number allows the stone and its document to be matched before it is set.
That information is valuable because it creates a common language. Rather than relying on vague descriptions such as “near colourless” or “eye clean”, you can compare diamonds using consistent criteria. It also protects you from paying for a quality claim that cannot be verified.
A report is not, however, a beauty score. Two round brilliant diamonds can share the same carat weight, colour and clarity grades yet look noticeably different because of their proportions, facet pattern and light return. The same is true for fancy shapes such as oval, pear, emerald and radiant cuts, where personal preference plays a bigger role.
Lab diamond grading report review: start with the issuing laboratory
The name of the grading laboratory matters. Different laboratories may use different standards, language and report formats, particularly for lab-grown diamonds. A recognised independent laboratory provides a more useful reference point than an in-house document created by the seller.
Look for a report that clearly identifies the diamond as laboratory-grown, names the grading laboratory, includes a report number and gives enough detail to assess the stone properly. If the report can be independently checked using its number, that adds another layer of confidence.
It is worth being careful with the word “certified”. In jewellery, people often say a diamond is certified when it comes with a grading report. Strictly speaking, a laboratory grades the diamond's characteristics rather than guaranteeing its future value, beauty or investment performance. A reputable jeweller should be comfortable explaining the difference without using the language to pressure you.
At TJ Gold & Diamond, the report is reviewed alongside the diamond itself, not treated as a substitute for skilled selection. That matters when the diamond is being chosen for a particular design, metal colour and setting style.
Read the 4Cs in the right order
Many first-time buyers start with carat weight, then chase the highest colour and clarity grades their budget allows. That is understandable, but it can lead to compromises that are easy to spot once the ring is made.
Cut and proportions come first
For round brilliant diamonds, cut quality and proportions strongly affect brightness, fire and scintillation. A well-cut diamond returns light efficiently and looks lively as you move your hand. Tables, depth, crown and pavilion angles help tell this story, although no single measurement should be judged in isolation.
Fancy-shaped diamonds need an even more visual approach. An oval may show a bow-tie shadow through its centre. A pear can look beautifully elongated but may have uneven shoulders. An emerald cut reveals its clarity more readily because of its broad, step-cut facets. The report gives useful measurements, but videos, photographs and an expert inspection show whether the diamond is appealing.
Colour is easier to see in some settings than others
Colour grades describe the presence of body colour, generally from colourless through to increasingly warm tones. In white gold or platinum, a near-colourless diamond often gives a crisp white look without the price jump of the very highest grades. In yellow gold, a faint warmth may be far less noticeable and can even complement the setting.
The right choice depends on the diamond shape, your sensitivity to colour and the metal you love. There is no prize for buying a grade you cannot see once the diamond is set.
Clarity should be judged with the eye, not only the grade
Clarity records internal inclusions and external blemishes under magnification. A diamond can be eye-clean at a lower clarity grade, meaning its inclusions are not readily visible without magnification. This can offer excellent value, especially in smaller diamonds and brilliant cuts that conceal inclusions well.
For larger stones, emerald cuts and designs with an open view of the diamond, clarity may deserve more attention. Also consider where an inclusion sits. A tiny inclusion near the edge may be hidden or protected by a claw, while one directly beneath the table can be more apparent. The plot is a map, not a complete picture of visibility.
Carat weight is not the same as face-up size
Carat measures weight, not diameter. Two diamonds of identical carat weight can look different in size when viewed from above, especially across different shapes. An oval or pear often appears larger than a round diamond of the same weight, while a deep-cut stone may carry more of its weight below the girdle and face up smaller.
Check the millimetre measurements on the report. They are particularly helpful when you have a specific ring proportion in mind or want to compare two similarly graded stones.
Check the details that reports cannot settle
A careful review should include the report, but not end there. Ask to see clear imagery or a video of the actual diamond. Look for transparency, even brightness, pleasing contrast and any obvious dark areas. If you are comparing stones, view them under similar lighting and at a similar magnification.
Fluorescence may be listed on some reports. Its effect varies. In many diamonds it has little visible impact, but stronger fluorescence can sometimes influence appearance under ultraviolet light. It is simply one detail to discuss in context, rather than an automatic reason to reject a stone.
For CVD-grown diamonds, post-growth treatment may also be disclosed. Treatment is not inherently negative when it is properly identified. Full disclosure lets you make an informed decision and ensures the stone is priced accurately.
The report also cannot tell you whether a diamond is a good match for your chosen setting. A fine point on a pear or marquise needs thoughtful protection. A very large centre stone may call for a lower profile if you work with your hands. A jeweller who designs and sets rings in-house can consider these practical details before the diamond is committed to a design.
Match the report number before the diamond is set
Before purchasing a loose lab-grown diamond, confirm that the report number matches the laser inscription where one is present. The inscription is extremely small and may require magnification to see. It should correspond exactly with the report and with the invoice description.
Keep a digital and printed copy of the report with your jewellery records. It is useful for insurance, future resizing conversations, valuation support and identification. Once a diamond is set, the inscription may be harder to access, so this check is best completed beforehand.
Choose value, not a spreadsheet winner
The best lab-grown diamond is rarely the stone with every top grade. It is the stone that looks beautiful, has reliable documentation, fits your setting and leaves room in the budget for craftsmanship that will hold up over time.
A clear report lets you compare fairly. Skilled guidance helps you notice the details a report cannot capture. Bring the certificate into the conversation, ask direct questions, and choose the diamond that feels right when it is paired with the ring designed for your story.
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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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