Natural untreated solid Australian white opal from Lightning Ridge area, cut and polished to show its natural beauty, set in 925 stamped sterling silver setting on a silver chain. Dimensions: 14x10x4.5 mm. Opal colors: soft orange-red hues, at some angles becoming green. Play of color depends on lights condition, pictures are made indoors and outdoors. Untreated, just straight from the ground to finished piece of jewelry. 45(+5 adjustable)cm silver chain is included, so you can wear it right away. 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.