10.30 Carat Ceylon Sapphire and Diamond Cocktail Ring.  Historically, the most famous sources for blue sapphire are Burma, Kashmir and Sri Lanka (known as Ceylon prior to 1972). Of the three, Sri Lanka has been the most prolific producer. This vivid blue center stone is surrounded by 1.80 carats of alternating round diamonds and round sapphires. Set in 14 karat white gold.