DiamondBuzz
RJC introduces regulations for LGD segment
The Responsible Jewellery Council (RJC) has issued a comprehensive set of regulations on the ethical, social, human rights and environmental aspects of lab grown diamonds for its 2,000-plus members.v The 33-page document establishes responsible business practices throughout the jewelry and watch supply chain
Its Laboratory Grown Materials (LGMS) 2025 standard is a set of 28 provisions – from legal compliance, working hours and forced labor to health and safety, hazardous substances and grading analysis.
RJC members, among them De Beers, Lucara, Signet Jewellers, Leo Schachter, Cartier and Harry Winston, must have their facilities certified as compliant by the RJC within a year if they handle lab growns. Non-members are encouraged to use the LGMS to improve their business practices.
LGMS certification provides a strong system for assuring stakeholders, shareholders, customers and business partners that a company conducts its business responsibly says the London-based RJC
DiamondBuzz
CVD Synthetic Fashioned To Imitate A Rough Natural Diamond
The Near-Colorless Stone Is Believed To Be The First Time Creators Of A Synthetic Chemical Vapor Deposition (CVD) Diamond Have Shaped It To Resemble A Rough Diamond
The 6.87-carat near-colorless CVD diamond was shaped to resemble a natural rough octahedral crystal but showed distinct synthetic features under microscopic and spectroscopic analysis.GIA’s tests confirmed the stone’s synthetic origin, noting polishing marks, facet junction roughness, and luminescence patterns inconsistent with natural diamonds.
No evidence currently suggests widespread substitution of synthetics for rough natural diamonds, but existing detection tools could be adapted if such cases increase.
The near-colorless stone is believed to be the first time creators of a synthetic chemical vapor deposition (CVD) diamond have shaped it to resemble a rough diamond, according to an article in the spring issue of the institute’s Gems & Gemology quarterly journal.
Upon investigation with the use of raman spectroscopy, the results confirmed that the material was a diamond, with its near-octahedral shape similar to that of a natural rough crystal. Further analysis showed that it was not a true octahedron, as only one set of opposing faces was parallel. Microscopic observation under differential interference contrast revealed extremely flat faces marked mainly by parallel polishing lines, unlike the growth steps and trigons typically seen on natural octahedral faces. The facet junctions were extremely rough, possibly due to measures taken to improve the color, after which the main faces appear to have been repolished, the institute explained.
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