Vintage Canadian Platinum Solitaire Diamond Ring | 0.55ct SI1/SI2 H/I | SZ 6.25 | brooch This ring comes with a

This ring comes with a third party Certificate of Appraisal with an Appraised Retail Value of $4

50mm Weight 33

Metal 18k Yellow Gold Size 4 3/4 Width Top: 12

00 ct Smoky Quartz

Round Brilliant Diamond Carat Centre: 1

Vintage Canadian Platinum Solitaire Diamond Ring | 0.55ct SI1/SI2 H/I | SZ 6.25 | brooch This ring comes with aMetal Platinum Size 6 1 4 Width Front: 5. 30mm, Back: 2. 00mm Gemstone Round Brilliant Cut Diamond Carat 0. 55ct Clarity SI1 SI2 Colour H I Cut Good Fluorescence Yes Based on the platinum alloy used in this piece and the diamond cut, it is most likely from the late 1950 or 1960s. The manufacturer of the piece is Corona, a Canadian manufacturer based out of Montreal.