Vintage Canadian Platinum Solitaire Diamond Ring | 0.55ct SI1/SI2 H/I | SZ 6.25 | new356 21 mm Gemstone Round Brilliant

21 mm Gemstone Round Brilliant Cut Diamonds Carat 0

Metal 18k Yellow Gold Size 9 3/4 Width Top- 15

65mm Gemstones Round Pearl

20mm Gemstone Square Cut Blue Sapphires

Vintage Canadian Platinum Solitaire Diamond Ring | 0.55ct SI1/SI2 H/I | SZ 6.25 | new356 21 mm Gemstone Round BrilliantMetal 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.