We handpick all our tanzanites from our trusted supplier in Australia, who are engaged in the complete process from mine to market. Tanzanites are coming in wonderful purple hues and are almost always heat treated. Do note that this is not our full stock, so reach out to us, if you’re looking for something different than what is displayed here. Tanzanites rank a 6.5-7 out of 10 on the Mohs Scale.