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In October 2014, Sotheby's Hong Kong achieved consecutive per-carat price records for Kashmir sapphires – first with the 12.00 carat Cartier sapphire ring at US$193,975 per carat, then with a 17.16 carat sapphire at US$236,404, and again in June 2015 when the per-carat auction record was set at US$240,205. [39]
The only color corundum stone that the term sapphire is not used for is red, which is called a ruby. [1] Pink colored corundum may be either classified as ruby or sapphire depending on locale. Commonly, natural sapphires are cut and polished into gemstones and worn in jewelry.
A total of 6,974 metres of diamond drilling was completed in 65 holes. Ruby and pink sapphire was found in 48 of the holes. At Aappaluttoq, the ruby and pink sapphire mineralization occurs in a corundum (ruby-sapphire) alteration band that exhibits trench-to-trench and drill hole-to-drill hole continuity.
Mineralogist and Tiffany gem expert George Kunz (1856–1932) was commissioned by wealthy financier J. P. Morgan (1837–1913) to acquire an impressive gem collection for an exhibit at the Paris Exposition of 1900; the Star of India was among the stones Kunz procured. [4] The Star of India is a huge blue star sapphire weighing 563.35 carats.
Black star sapphire, also known as 'natural star sapphire' is a type of corundum (aluminum oxide). It is usually cut into a dome shape to show a star feature. If it is cut with a flat or almost flat face, then a golden colour is revealed. The chemical composition and features for black star were analyzed in the Journal of Gemmology.
Rather than cut it into smaller pieces, Daniel Mckinney, one of the owners of the gem, sought to use the whole stone and kept it as one crystal to pay tribute to humanity. [2] In 2003 the Guinness World Records was awarded to The Millennium Sapphire as The World’s Largest Engraved Sapphire at 61,500-carats. Today, it is still regarded as the ...
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