Product Details. Genuine Gemstone. Base Metal: Stainless Steel. Coating: 14K Gold PVD Stainless Steel. Add this charm to your One Love Chain Necklace.. Comes with a little card that says:. Tanzanite - The December Birthstone. Turn your desires into reality, attract positivity, expand your horizons. Tanzanite is the stone of fidelity, love, and confidence. Let it serve as a reminder to be open and true to yourself, and to the people you love.