October has two birthstones: opal and tourmaline ... The gemstone is known for its "play-of-color," or ability to shift hues. Rough opals appear white, but once polished, their surface shines ...

Here's what you need to know about December's birthstones, including their colors, symbolism and more. December has three birthstones: tanzanite, turquoise and zircon. Of the three, tanzanite is ...