Wholesale Rough Green Pistachio Opal Uniqueness Guaranteed: Every item is one-of-a-kind, making them ideal for all projects or designs. Choose your quantity: 1 pound, 1 kilogram, or 5 kilograms Avg Size Range: (1 To 2 Inches) Sizes Vary Material Origin: (Brazil) Opal is a gemstone featuring high water content, and it can form inside sedimentary or volcanic rock and even some ores like limonite. Pistachio opal is a variety of common opal, meaning it does not have the opalescence or play of color that precious opal does. Pistachio opal derives its color from iron atoms included in its molecular structure. Custom Requests: Have specific preferences? Leave a message with your order, and we'll do our best to accommodate your requests if possible. Handmade items vary in size, shape, and color when selected randomly (the highest quality items are chosen first). They'll be as beautiful as those in the photos.