![Rough Opal - Boulder Opal - RW/CD-B230001](http://www.opalscanada.com/cdn/shop/files/20230430_114239_1_{width}x.jpg?v=1682882624)
Large 40x30mm dark brown-black crystal boulder opal hosted in larger solid dark basalt. Bright, red multi-color broad rolling flash fire. Opal is rubbed only enough to expose the color potential; ready for carving, trimming and polishing. Create a unique pendant.