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Samarian Spinel, the world's largest spinel; Menshikov Ruby, the world's second largest spinel set on top of the Great Imperial Crown of Russia; Timur Ruby, believed to be a ruby until 1851, hence its name; Black Prince's Ruby, the famous spinel mounted on the Imperial State Crown of the United Kingdom
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When jewelry containing sapphires or rubies is heated, those stones should not be coated with boric acid (which can etch the surface) or any other substance. They do not have to be protected from burning, like a diamond (although the stones do need to be protected from heat stress fracture by immersing the part of the jewelry with stones in the ...
He possesses the world’s largest and famous cobalt blue spinel from Luc Yen mine in Vietnam, and one of the largest red spinel weighing 110 carat. [14] Yavorskyy is the author of Terra Spinel, a book he privately published and printed in 2010. [15] The book contains images that document some of his spinel finds over the years.
Marcasite jewellery has been made since the time of the ancient Greeks. [3] It was particularly popular in the eighteenth century, the Victorian era and with Art Nouveau jewellery designers. [3] [2] When diamonds were banned from public display in Switzerland in the 18th century, marcasite, along with cut steel, was turned to as a replacement. [4]
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The creation of this crown, like the previous one, was entrusted to a group of court jewelers, headed by master Samson Larionov . It was topped with a cross of nine “quadrangular” diamonds of Greek cut, fixed on a huge lal (as red and pink spinels and tourmalines were called in Russia at that time) worth 60 thousand rubles - most likely the ...