VINTAGE OPAL & RUBY ENGAGEMENT HAREM RING: This ring is set with 8 fiery opals that display flashes of pink, blue, green and purple. 8 rubies occupy the bottom tier of this ring, then the opals, then 8 more rubies and finally topped with a larger ruby. .75CTW rubies are prong set and .50CTW opals are bezel set in 18K gold. Total weight 7.0 grams. Size 7.