Ross-Simons - C. 1990 Vintage Onyx and .50 ct. t. w. Diamond Cuff Bracelet Links in 14kt Yellow Gold. C. 1990. Perfect for a gentleman of bold style, these elevated Estate collection cuff links feature classic 10x10mm cushion-cut onyx squares framed in .50 ct. t. w. round brilliant-cut diamonds. Finely crafted in polished 14kt yellow gold. Diamond and onyx cuff links. Exclusive, one-of-a-kind Estate Jewelry.