RARE Find and one of a kind piece. These are hard to find in Platinum!! Ring Size: 12.25 FREE RING SIZING. Gram Weight: 3.6 grams. The item "Antique 1920s 1.50ct Old Mine Cut Diamond Blue Sapphire Platinum Filigree Ring" is in sale since Thursday, September 29, 2016.This item is in the category "Jewelry & Watches\Fine Jewelry\Fine Rings\Diamond". The seller is "oldtreasures333" and is located in American Fork, Utah. This item can be shipped worldwide.