gold Ballerina ring with diamond

An 18k gold Ballerina ring set with an oval brown diamond (2.78 crt) surrounded by 28 baguette-cut diamonds (2.82 crt), signed: Cartier and with the hallmark and number: OHB, 124(95) for Oscar Heyman, USA, 1975.

weight: 6.40 g
ring size: 16.5 mm / 6 US / 52