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Because rubies host many inclusions, their clarity is evaluated by the inclusions’ size, number, location, and visibility. Rubies with the highest clarity grades are known as “eye-clean,” because their inclusions are the least visible to the naked human eye. [26] Rubies may also have thin, intersecting inclusions called silk.
Some gemstones that are popularly or historically called rubies, such as the Black Prince's Ruby in the British Imperial State Crown, are actually spinels. These were once known as "Balas rubies". The quality of a ruby is determined by its color, cut, and clarity, which, along with carat weight, affect its value. The brightest and most valuable ...
The ruby sold for a record US$30.42 million on 12 May 2015 at a Sotheby's auction in Geneva, Switzerland, to Heidi Horten. [3] [6] It was originally estimated to be worth between US$12 and 18 million prior to auction [1] [9] [10] and bidding started at 11 million Swiss francs or US$11.8 million.
After paying $150,000 for the raw stones, Kogen has transformed them into exquisite rubies worth an estimated $530,000 in the marketplace. Learn more about Don. Show comments. Advertisement.
Spectroscopy of rubies from the Aappaluttoq occurrence in Greenland confirm the presence of chromium as well as showing absorption in the UV region indicating high Fe (iron) content. [4] Characteristics reported in Thirangoon, 2009, include: most of the crystals examined contained bohmite or kaolinite crystals. The presence of these minerals ...
The transparent red spinels were called spinel-rubies [14] or balas rubies. [15] In the past, before the arrival of modern science, spinels and rubies were equally known as rubies. After the 18th century, the word ruby was only used for the red gem variety of the mineral corundum, and the word spinel came to be used. [16] "
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