7.5 mm It's as lovely as the stars in the night sky ^ ^ Pyrite in fluorite is a very rare and beautiful natural stone, where pyrite (fool's gold) is contained within fluorite (fluorspar). The transparent fluorite (blue, purple, green, etc.) is scattered with golden pyrite with a metallic luster, giving it a mysterious appearance that looks like a **"small universe" or "starry sky"**, and is popular with collectors. Inner diameter: 16 cm Natural stone Power stone Rare stone Also listed on other sites ^ ^