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INDUSTRY INSIGHTS

THE GEM ACADEMY

Spring 2023

 PART 2: Quality & Shape 

Welcome back!

Welcome to the eagerly anticipated second installment of our online report! This time, we're focusing on shapes and qualities of laboratory-grown diamonds. Discovered through the analysis of major wholesale platforms. Let's go!

The qualities of laboratory-grown diamonds are increasing every year. The findings of this report may surprise you as the qualities are even better than expected!

Let's find out the common colours, clarities, and shapes of laboratory-grown diamonds on the market.

This report utilises multiple resources to bring you these insights.  We'll mainly focus on data obtained from one major online wholesaler and more than 300,000 stones.

This information is correct for 15/03/2023.

SCROLL

REPORT charts - march 2023-2.jpg

Laboratory-grown diamonds in numbers

Colour

Colour grades

Overall, the equivalent colour grades of laboratory-grown diamonds are exceptionally high. The majority of them are completely colourless.

This report finds that 65% of laboratory-grown diamonds are equivalent to D-E-F colour grades. 

Approximately 2% are equivalent to 'J' or below.

March 2023 - colour all.jpg

Breakdown of HPHT v CVD colour grades

HPHT lab grown colours march 2023.jpg

HPHT colour grades

Wow.

 

 Nearly 95% of HPHT laboratory-grown diamonds traded today are equivalent to D-E-F colour grades. 

This has increased over the last 6 years. In 2017, GIA reported that 72% of HPHT laboratory-grown diamonds were in the D-E-F 'colourless'  range.

The most common colour grade for HPHT laboratory-grown diamonds is 'D' - the highest colour grade possible.

 

This accounts for 57.7% of the HPHT-grown stones available.

CVD colour grades

In 2016, GIA reported that the majority (67%) of CVD laboratory-grown diamonds were 'near colourless' - equivalent to G-J colour grades.

CVD laboratory-grown diamonds have typically exhibit lower colour grades compared with HPHT-grown stones due to the CVD growth method resulting in internal strain.

This report reveals that the majority has shifted into the 'colourless' range. Nearly 51.9% of CVD laboratory-grown diamonds being traded today are within the D-E-F colour grades.

The most common colour grade for CVD laboratory-grown diamonds is 'F'. This accounts for 29.4% of CVD-grown stones available.

CVD lab grown colours march 2023.jpg
CVD colour breakdown March 2023.jpg

A note on treatments for CVD

Most CVD laboratory-grown diamonds are treated post-growth to remove colour (from brown to more colourless). This information is rarely included on laboratory-grown diamond reports which instead offer over-disclosure statements such as "this laboratory-grown diamond may have been subjected to post-growth treatments". Therefore, it is with regret, that no new data is available on treatments in this report.

It has been estimated that approximately 75% of 'colourless' to 'slightly tinted' CVD laboratory-grown diamonds on the market have been treated to remove colour.

Clarity

Clarity grades overall - March 2023.jpg

Clarity grades

90% of all laboratory-grown diamonds on the wholesale market have a clarity grade equivalent to VS and above. The most common clarity grade is VS1.

Less than 0.2% have grades within the 'Included' range (I1-I3).

Less than 0.5% have grades equivalent to 'Flawless' and 'Internally Flawless'.

REPORT charts - march 2023-2.png
REPORT charts - march 2023.png

HPHT v CVD

clarity grades

CVD laboratory-grown diamonds have historically had a better reputation for clarity grades compared to HPHT. 

 

This is not valid today as HPHT laboratory-grown diamonds have a similar dispersion of clarity (if not a little bit better overall).

HPHT synthesis produces significantly more stones in the VVS range.

The most common clarity grade for both HPHT and CVD laboratory-grown diamonds is VS1. 

HPHT also produces more stones in the SI range but only by a small percentage. Less than 10% of stones on the market for both CVD and HPHT have clarity grades of SI1 and below.

Cut & Shape

Shape

March 2023 report - shape comparison Plat 1.jpg

 The most common shape available is round brilliant followed by oval and pear cuts. 

Cut grades

The vast majority of laboratory-grown diamonds have equivalent cut-grades to 'excellent'.

An attributing factor is the relatively low value of the product. Stones can be cut for beauty as opposed to retaining maximum yield from the rough crystal.

Another factor is the increased use of automated cutting processes.

March 2023 report - cut quality Plat 1.jpg

Most laboratory-grown diamonds have an 'EXCELLENT' cut grade. 

8.96ct leaf design fire diamond image - odd cut of the month March 2023.jpg

Odd shapes

Interesting shapes of laboratory-grown diamonds are on the market.

 

This leaf design is available from 

Fire Diamonds. It utilises large shallow crystals being created by CVD synthesis.

The availability of the material along with the reduced need to maximise yield will open opportunities for many new cut designs.

CVD hamsa March 2023 lab grown diamond report.jpg

'Hamsa' shape by Fire Diamonds

CVD buddha March 2023 lab grown diamond report.jpg

'Buddha' shape by Lab Grown Diamonds USA

CVD letters March 2023 lab grown diamond report.jpg

Letters by Lab Grown Diamonds USA

Copy of Insta Spring 2023.png

Photo credit: GIA

New record-breaking sizes

In May 2023, GIA announced that they assessed this 34.59ct G, VS2 emerald-cut grown by Ethereal Green Diamonds. 

This is the largest laboratory-grown diamond to be confirmed by a producer or grading laboratory.

 

There has been a report of a 38ct oval.

Watch this space. 

CVD-grown

24.94 × 13.95 × 9.39mm

I hope you enjoyed this report.

Come back for Part 3: Price

Releasing June 2023

THE GEM ACADEMY

REPORT

Data taken 15/03/2023 unless otherwise stated.

Spring 2023

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© Julia Griffith

All rights reserved. No part of this Report may be copied, reproduced, transferred, recorded or transmitted in any form, or by any means, to any audience, without the express written permission of Julia Griffith FGA DGA EG.

Comments (4)

Ospite
18 mag

Wonderful data and descriptions, informative and enlightening as always. Well done Julia! :)

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Ospite
18 mag

Even more fascinating information and insights. Thank you for all your hard work and for sharing the results.

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Ospite
17 mag

Great info, information and learnings! Thank you for the reports! John

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Ospite
17 mag

Really interesting reading, thank you Julia.

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