Mind-boggling colour. Rosarita (Gold Slag) is a by-product of the gold refining process in Alaska in the 50s and 60s. Trace amounts of gold would be lost and end up melted in with the sand from the refining process, producing a beautiful colored - essentially a glass - colored with the gold. Nowadays, the process doesn't leave enough gold in the sand for it to color it, so this material is limited to old caches. Cabochon, flat back, no hole, domed top.
27mm x 39mm By the each.