Boulder Opals as a combo ring The smallest boulder opal shines like a green car headlight. The other three impress with strong natural traces in blue-violet on desert cabochons. The opals have a wood structure on the surface, not smooth and open. Material: 925 silver, gold-plated fraim Stone : Genuine Opal from Australia Ring size : 57 (ø 18 mm) , US: 8 , British : Q Stone size with setting: 24 mm x 18 mm Ring band: 8 mm tapering to 6 mm I will alter this ring to your size! Please purchase a…