Cartier Royal ring, 18K white gold, one 2.60 carat rose-cut diamond, black lacquer, brilliant-cut diamonds.

Cartier Royal ring, platinum, one 22.75 carat sugarloaf sapphire from Ceylon, brilliant-cut diamonds.

Cartier Royal ring, platinum, one 20.02 carat emerald-cut pink spinel, onyx, brilliant-cut diamonds. 

Photos courtesy Cartier