Rings by Yvonne Gilhooly Enso Series. Black mabe pearl set in a sterling silver cup setting edged with 18ct yellow gold upon my signature Enso shank. Handmade by Yvonne in her studio in the west coast of Scotland. Features Primary Material : Sterling silver Other Materials : 18ct yellow gold. Black mabe pearl One of a Kind : No Metal : Sterling silver. 18ct yellow gold Gems : Black mabe pearl Hallmarked : No Cleaning InstructionsClean using a soft cloth.Do not dip or abrade.