Tourmaline is a chameleon of a gemstone, presenting itself in ruby reds, emerald greens, citrine yellows, and even blends of greens and pinks called watermelon. Cut from six-sided crystals, tourmaline is hard but brittle, which means it can be difficult set in a ring or bracelet. And because inclusions and color variability are common in tourmaline, it can be equally difficult to find two stones that are a precise match, making it a poor...Continue Reading