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Medieval gold ring found in castle in Slovakia has rare purple sapphire imported from Sri Lanka
An analysis of a 700-year-old ring reveals a unique reddish-purple sapphire set in 18-karat gold with a lion decoration.
A pink diamond just sold for over US$ 14 million – no wonder, when you look at the mysteries behind their chemistry
The Marie-Thérèse Pink, thought to have belonged to Marie Antoinette, was auctioned by Christie’s in New York.