Product Details. KOZAKH Certified Fine Jewelry. Genuine Tanzanite. Handcrafted in the USA.. Available in 14K Gold or 14K White Gold.. Add this charm to your One Love Chain Necklace.. This charm comes on a beautiful 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.