The beautiful vintage oval cut opal and sapphire engagement ring is secured in a art deco diamond gold setting, An oval opal is nestled amid a glorious halo of glimmering round sapphire and diamonds. The white opal and the diamonds are secured in prong settings and create a stunningbrilliance design. This elegant sunflower opal ring in 14k rose gold exudes feminine charm, Anniversary gift for herProduct Information Engagement Ring: Metal Sterling Silver, 10k/14k/18k gold, Platinum Center Stone Opal Shape Oval Weight approx 1.2 carat Size 6x8 mm Accent stones Diamonds Set Prong, Pave Set Matching bands:Natural diamonds or turquoiseOpal is a hydrated amorphous form of silica; its water content may range from 3 to 21% by weight, but is usually between 6 and 10%. Because of its amorphous character, it is classed as a mineraloid, unlike crystalline forms of silica, which are classed as minerals.