DiamondBuzz
Diamond prices generally declined in September
Diamond prices generally declined in September, with notable sharp drops for round polished goods under 1 carat. The market was affected by US tariffs and the ongoing sale of De Beers, creating uncertainty.
- Key Declines:
- The RapNet Diamond Index (RAPI™) for 1-carat (round, D-H, IF-VS2) fell 0.9%.
- RAPI for 0.30- and 0.50-carat goods both dropped 6%.
- SI-clarity 1-carat rounds saw a larger decline of 2%.
- Strong Segments: Prices for larger sizes were mixed, but long fancy shapes, particularly in 2 carats and up, were “hot.” RAPI for 3 carats was flat.
- Trade & Tariffs: Demand at the Hong Kong show favored larger diamonds/fancies. US tariffs (especially the 50% rate on Indian goods) restricted overseas sales to the American market, despite steady business for independent US jewelers. The EU secured a zero-tariff deal, and Botswana is negotiating one.
- Production: Indian manufacturers cut polished production due to weak demand; August rough imports fell from July ($1.15 billion to $768.7 million).
- De Beers: The sale of Anglo American’s De Beers unit was in progress, with Botswana seeking a majority stake and Angola bidding for a minority holding.
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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