Rant and rave with the interchangeable smooth flat black spinal briolette with pink sapphire earrings by Trésor. The black spinal briolette can be changed with various stones like chalcedony or pink opal. Buy a few of these earrings so you’ll always be ready to sport the right look. Metal: 18k rose gold. Length: 2 ½ inches. Stones: Black spinal briolette, pink sapphire. Sapphire weight: 4.79 carats.