OPAL Raw Crystal - 3A-XL Polished Window - Raw Opal Crystal, October Birthstone, Welo Opal, 45308 colombianite Approximate Weight: 18

Approximate Weight: 18

Large: 170 - 230 grams

Weight: 988 grams

and is semi-regularly producing new colors every few years

If you would like specific pieces

OPAL Raw Crystal - 3A-XL Polished Window - Raw Opal Crystal, October Birthstone, Welo Opal, 45308 colombianite Approximate Weight: 18The window is polished, and the rest is raw. This listing is for AAA premium grade opal that is specifically selected for cutting lapidary purposes. Each piece is hand sorted to ensure that it has top grade fire, is 3 dimensional so that cabochons or faceted stones can be cut out of them, and they are crack free. What you see is what you get. These will often have patterns like honeycomb, pinfire, stripes, and other attractive color zoning features.