"Gypsy" dome ring with Ethiopian opal in 14K yellow gold, $1,830, sigwardjewelry.com. A special setting and multiple cuts make up this one-of-a-kind opal, pink spinel, and white diamond ring which ...

Kimberly McDonald One of a Kind Boulder Opal Ring with Pink Sapphire Bezel Set in 18K White Gold with Black Rhodium, $5,625; kimberlymcdonald.com ...

Yellow gold and brown diamonds offset its magical colors. John Hardy Modern Chain Dukun ring in 18K yellow gold with Ethiopian white opal and 1.54 carats brown diamond, $24,000, johnhardy.com Nina ...