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The Gem Academy releases lab-grown diamond report

Julia Griffith FGA DGA EG, founder of The Gem Academy and supplier to the Company of Master Jewellers, has released a new report that reveals insights into the wholesale market of laboratory-grown diamonds.

This report is the first in a three-part series. The first focuses on the volume and sizes of laboratory-grown diamonds that have come onto the wholesale market over the past six months. The second report is due to be released in May, covering quality and shape, and the third report will cover price.

These reports utilise a wide selection of reports, mainly focusing on data obtained from one major online wholesaler and 300,000 stones. This first instalment of the report, shares insights into the increasing numbers of large sizes of laboratory-grown diamonds from 3ct and above. The report also discusses how many stones have been seen on wholesale platforms weighing 20ct or more. There are also insights into the proportion of stones grown through HPHT and CVD synthesis respectively, and how this relates to the size.

Click here to read the full report.

Julia founded The Gem Academy in 2020 and has over ten years of experience within the gemmology industry. Julia previously worked at Gem-A, the longest-established gemological education organisation in the world.

Online Course

Julia also provides the Ultimate Guide to Laboratory-Grown Diamonds online course, which is highly recommended by previous students. One former student said: “What a superb course! Excellently written and presented in a well-thought-out, logical format. Very thorough, and covers every aspect of laboratory-grown diamonds from the growth processes, identification and treatments, great videos and infographics too! Definitely worth doing.”

Special 20% off for CMJ members, email Julia at for the code.


Julia’s one-day workshop is a must for those wishing to identify laboratory-grown diamonds. Her next workshop takes place in central London on 2 June 2023. Spaces are limited, so click here to register.


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