Near the dizzying heights of Mount Kilimanjaro in Tanzania (from which the stone is named) are the sites of the only commercially mined deposits of this precious stone. Discovered in 1967, tanzanite is hailed as one of the world’s newest gemstones. The stone is praised for its rarity and naturally brilliant blue tones. Tanzanite is said to be a thousand times rarer than the diamond and with only a few known natural deposits in the world, is set to become even more precious and collectable. Tanzanite is the ideal birthstone for December, along with turquoise, with its cool blue tones.