Amsterdam Diamond (Amsterdam Diamond), produced in South Africa, is also a famous black diamond. The rough diamond weighs 55.85ct, is dark black and opaque, so it is also the same under strong light, but this diamond has a very strong luster.
The diamond was cut and polished by Amsterdam Drucker & Sons. From October 1972 to January 1973, it took 3 months to cut into its 145 facets (including the waist facet), and a pear-shaped cut weighing 33.74ct. The diamond is 23.96mm long, 17mm wide and 12.3mm thick. The diamond was appraised by the famous Dutch gemologist Dr. Zwaan and confirmed that it was a natural black diamond. The diamond was exhibited at the European Diamond Council to commemorate the 700th anniversary of the founding of Amsterdam.
On November 14, 2001, the Amsterdam diamond was auctioned at Christie’s Auction Company in Geneva, Svizzera, with an estimated price of 517,700 Swiss francs, and the auction price was 587,700 Swiss francs (approximately 344,837 US dollars), making it the highest auction price in the world. Black diamonds, Amsterdam diamonds are considered the best quality black diamonds.
The Gruosi Diamond is the largest heart-shaped black diamond in the world, weighing 115.34ct. This heart-shaped diamond is the center stone of a necklace. The necklace is composed of 58.77ct small black diamonds, 378 small white diamonds and 14.10ct small green chromium vanadium garnets. All gems are set on a white gold base.
The rough stone of this diamond was produced in India in 1998 and weighs 300.12ct. The original plan was to cut into an oval shape. As the cutting and grinding work progresses, since this diamond is very easy to chip during cutting, it is extremely difficult to cut into an oval shape. I have no choice but to temporarily change the plan and cut it to heart. shape. The cutter of Gourvosi Diamonds is the Swiss de Griscono Jewelry Company. The entire cutting work was done in Antwerp, Belgium. The whole process took 3 years and the weight loss reached 184.78ct.
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