Victorian Sapphire and Diamond Three Stone Ring For Sale at 1stDibs A vintage three stone Sapphire and Diamond ring SOLD OUT Vintage Sapphire and Diamond 3 Stone Ring For Sale at 1stDibs Vintage Three Stone Diamond Ring For Sale at 1stDibs. RESERVED A vintage 1950s three stone ring. Centre stone an ink black blue sapphire, measures 4x4mm (est 0. 30 carats). Each side a brilliant cut white diamond 3. 4mm (est 0. 15 carats) Colour H j, clarity Si. Platinum head measures 12x5mm, depth 4. 7mm. Shank is stamped 18CT PT although a little rubbed. Weight 1. 8grams. Band tests as 18 carat gold. Size N, we can resize free of charge.