Natural untreated Australian boulder opal from Yowah area cut and polished to show its natural beauty. Pendant has 925 silver bail. Dimensions: 21x16x6 mm without a bail. Twisted leather strap 50cm with 5 cm adjustable length. Treatment: untreated. Has green and blue colors, with some gold/orange. Play of color depends on lights condition, pictures are made indoors with artificial and natural light. Australian opal is a sedimentary variety which is stable, is not affected by contract with any liquids and can last very long time if is used with care. Opal itself is relatively soft stone, but ironstone host rock gives it extra strength and protection.