The 423 carat Logan Sapphire was cut from a crystal mined in Sri Lanka and is one of the world's largest faceted blue sapphires (it is about the size of an egg). It is the heaviest mounted gem in the National Gem Collection, and in its brooch setting is framed by twenty round brilliant-cut diamonds, totaling approximately 16 carats.
A SAPPHIRE AND DIAMOND FLOWER BROOCH, BY CARTIER The vari-cut diamond cluster centre set en tremblant, within the calibré-cut sapphire petals to the graduated baguette-cut diamond stem and brilliant-cut diamond leaf (two sapphires deficient), circa 1960, 7.0 cm. high, with French assay marks for platinum and gold, in red leather Cartier case Signed Cartier OCC, No. 1655
The Logan Sapphire Brooch.Historically the finest sapphire gems came from Sri Lanka and Burma, and the same is prettymuch true today. Sri Lanka, nicknamed the "Gem Island," has been an important source of sapphires, rubies and other gemstones for more than two thousand years.The stones that have been eroded from Sri Lanka's central mountains are still plucked by hand from gravel deposits that cover most of the southern half of the island.
Sapphire, diamond and gold twin hearts brooch. Tiffany & Co
Gold, silver, and diamond brooch, set with an octagonal sapphire engraved with the arms of Johann Hugo von Orsbeck (1634-1711), appointed Archbishop Prince Elector of Trier, 13 July, and Bishop of Speyer, 16 July 1676, Abbot of Prum and Provost of Weissenburg. Now framed within a foliate border. German. Sapphire intaglio: 17th century. Setting: 19th century.