These are a 18x13mm howlite cabochons. Howlite is naturally white. It accepts dyes well and much of the turquoise you see in decorative jewelry is actually howlite. It comes in light turquoise and a deeper blue. This is the deep blue turquoise. 18x13mm Dyed Howlite Turquoise Flat Backed Semi Precious Gemstone Cabochon 325x
