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Diamonds, because of their hardness, are one of the few gemstones that have a recycled market. Recycled diamonds are diamonds that have been polished and set into jewelry, then removed and possibly re-cut before sale back into the diamond industry. This sector accounts for 5%–10% of market supply. [25]
Bourses are the final tightly controlled step in the diamond supply chain; wholesalers and even retailers are able to buy relatively small lots of diamonds at the bourses, after which they are prepared for final sale to the consumer. Diamonds can be sold already set in jewelry, or sold unset ("loose").
Most diamonds used as gemstones are basically transparent with little tint, or white diamonds. The most common impurity, nitrogen, replaces a small proportion of carbon atoms in a diamond's structure and causes a yellowish to brownish tint. [36]
Lab-grown diamond sales surged from just 2% of the global diamond jewelry market in 2017 to 18.4% in 2023, according to data provided by Zimnisky. Additionally, the case for buying diamonds as an ...
In December 2022, lab-grown diamonds accounted for 15.7% of all engagement rings sold in the U.S., nearly double the 2021 figure of 7.9%, per jewelry-industry analytics company Tenoris.
HB Antwerp uses a blockchain to track diamonds and to route more money to the stones' home country. Industry giant DeBeers has followed suit.
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