1990-1999 Diamond Tiffany & Co. More Rings. From our unique collection of Contemporary Rings, this Tiffany & Co. piece is offered for sale online by Gem de la Gem. Global shipping is available. This is an incredibly beautiful platinum diamond ring by Tiffany & Co. France. It features a 12ct oval faceted pink tourmaline with approximately 2cts of fine diamonds. Diamonds are G color, VS1 clarity. Ring is size 6 and weighs 15.3 grams. Clearly marked "Tiffany & Co. France PT950" with French hallmarks.