A sculpture-in-the-making wears a gem-filled Cartier High Jewelry watch like a necklace, with cabochon-cut rubies, sapphires, emeralds, and emerald-cut diamonds arranged like mere patchwork.

Kate Middleton wore a pair of diamond-and-sapphire earrings that belonged to her late mother-in-law, Princess Diana. ... "The sapphires in Diana's earrings are cabochons, ...