Turquoise is one of my favorite gemstones. The blues and greens are so vibrant. I design[tweet_dis_img][/tweet_dis_img] in both silver and copper. Did you know? Turquoise is a copper aluminum phosphate mineral. It has a hardness of 5 to 6. This means it can tend to be brittle if not stabilized for strength. You may notice a black backing on some turquoise cabochons. … [Read more...]