Howlite

Howlite turquoise is dyed to look like the real turquoise.  Howlite itself is a natural stone originally in white with black matrix running through the beads. Howlite is harder than Turquoise and after the color treatment, it is almost the same color as the real ones.  With the relatively much lower price comparing with genuine Turquoise, makes Howlite turquoise a perfect substitute.