https://alexeyfilatov.ucraft.site/12-most-expensive-stones EREMEEVIT GEM 1/12 Eremeevite is a unique aquamarine-blue stone, one of the ten rarest minerals in the world, along with taaffeite, musgravite and blue garnet. It was first found in the Adun-Chilon mountains in Siberia in 1883. This gemstone has the same hardness as quartz, from 6.5 to 7.5 on the Mohs scale. It is ideal for jewelry making. Eremeevit - $ 2,000 per carat