GIA Certified 4.32 Carat Madagascar Blue Sapphire and Diamond Platinum Ring This is a stunning blue sapphire, diamond and platinum ring. The center stone is a large 4.32 carat Madagascar blue sapphire and is set at center (GIA #2131250291), while 0.95 carat of oval diamonds affix to each side, and 0.30 carat (H/I/SI2) of pave set diamond adorn the shank. Currently a size 5.5 Complimentary sizing is available upon request.