A Ring, 18 kt. gold, set with a blue oval cut "Paraíba" turmaline with the approximate weight of 23,71 ct. and 23 brilliant cut diamonds with the approximate weight of 0,71 ct., Hong Kong, 21st C., with GIA 7201314334 certificate Dimensões (altura x comprimento x largura) - 18,24 x 15,22 x 12,48 cm; Med. - 14 (17 mm) cm; Peso - 12,2 grs. g. Notes: Discovered in the 80s of the 20th C., the Paraiba tourmalines are the most highly-rated gemstones in the market, more rare than diamonds. The ratio of the tourmaline is one to a million diamonds. This variety of tourmaline is even more. The known specimens have been found only in places rich in copper, that is the case of Paraiba mine in Brazil and, more recently, in Nigeria and Mozambique.
The value of this type of stones, depending on their colour saturation, quality of its size and weight, It is currently estimated in $ 10,000 per carat for stones of sizes over 3 carats, being extremely rare specimens weighing over 20 carats; in fact, we are not aware of any sale, on the market of international auctioneer, of a gem weighing 23.71 carats, as is the case.