Amethyst
This popular purple stone is the February birthstone and symbolizes the sixth wedding anniversary. Amethyst is the purple variety of quartz.
In ancient times, amethyst was thought to ward off drunkenness.
Where it's Found: Around the world, notably Brazil, Bolivia, Uruguay, and Zambia.
Mohs Hardness Scale: 7
Charoite
Charoite is a distinctive purple stone with swirling patterns. It is one of few stones that can be identified on sight. There is only one place in the world that this unique stone is found.
Where it's Found: The Chara River area of Eastern Siberia.
Mohs Hardness Scale: 5-6
Tanzanite
Tanzanite was discovered in 1967 in Tanzania. This is the only place in the world that it is found. One allure of the stone is its trichroic quality, displaying different colors depending on its rotation or the source of light.
Where it's Found: Tanzania
Mohs Hardness Scale: 6-7
Holley Blue
Despite its name, Holley Blue is usually closer to a lavender variety of agate made even rarer by the fact that its source is on private land.
Where it's Found: Holley, Oregon, USA.
Mohs Hardness Scale: 6.5-7