Oscar Heyman Platinum 1.99ct Cushion Cut Sapphire And Diamond Ballerina Ring Center Sapphire: 1.99ct Cushion Cut Diamonds: 2.58cttw Baguette Cuts Circa 1974 Serial number. Center Diamond Weight: 2.58 Measurements: Size: 8 Metal Type: Platinum Metal Weight: 8.1 gr. Signed: Oscar Heyman Condition: Excellent. Stock: RR9300