I made a flower out of silver and glued a red synthetic opal in the center. The opal shines beautifully and sparkles depending on how the light hits it. Flower: Approximately 14 x 9mm (excluding the ring part) Opal: 4mm in diameter Chain length: Approximately 400mm Materials: Silver 925 Chain: Silver 925 with pure silver coating Synthetic opal: Silicon dioxide and resin Thank you for viewing.