CARTIER - A VERY FINE ANTIQUE EMERALD, DIAMOND AND PLATINUM RING, CIRCA 1910. Set with an oval emerald weighing approximately 3.00 carats, the frame and shoulders pavé-set with old-cut diamonds, mounted in platinum, signed Cartier. Purchased in the 1920s when the family was visiting Cartier in Paris. The family story states that while they were at Cartier, they were introduced to Russian Prince Felix Youssoupoff. The prince was said to have been consigning the ring for re-sale at Cartier.