SynaBaubles Big Diamond Chalcedony EarringsDetailsThe beauty of each Syna piece is its striking simplicity. These versatile 18k gold chalcedony Syna earrings-detailed with diamonds-will take you from the beach, to brunch, to the ballet. From the Syna Baubles Collection. 18-karat yellow gold. Champagne pave diamond dome, 6mm. Polished chalcedony cabochon drop, 12mm. Chalcedony, 15. 0 total carat weight. Diamonds, 0. 50 total carat weight. Post backs. 7/8"L overall.