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It was discovered that trace rare earths - particularly europium - are responsible for this wonderful glow.\u003c\/p\u003e\n\u003cp\u003eThis Europium-doped fluorite is grown for science - these crystals are valuable because they are extremely sensitive to many kinds of radiation (not just UV), so can be used as 'scintillators' for detecting the presence of x-rays.  Eu:Fluorite's glow is strong enough to change its color in direct sunlight.\u003c\/p\u003e\n\u003cp\u003eYou might be wondering \"why is fluorite jewelry is so rare when it's so cool?\" That's because fluorite is a really tricky material to cut.  It has low Moh's hardness (rank 4 on the scale), and on top of that has four perfect cleavage planes - it wants to break into perfect octahedrons.  Combined with one of the lowest refractive indexes of any gem, it requires special designs and extreme care when cutting - not for the faint of heart. Even pinching the stone too hard when bending the silver prongs can make it decide to start cleaving (as we learned to our dismay).\u003c\/p\u003e\n\u003cp\u003eBut, despite how hard it is to cut and set these, I think the incredible blue glow makes it all worthwhile! While the pendants need to be worn with a bit of extra care, the amazing change in color going from inside to outside is absolutely fantastic.\u003c\/p\u003e","brand":"Turtle's Hoard","offers":[{"title":"Long Hexagon (avg 3ct stone weight)","offer_id":48968243183904,"sku":"Pend_Fluorite_Hex_3","price":270.0,"currency_code":"USD","in_stock":false},{"title":"Rose Cut (avg 1-2ct)","offer_id":48968260682016,"sku":"Pend_Fluorite_Rose_1","price":160.0,"currency_code":"USD","in_stock":false},{"title":"Rose Cut (avg 3-4ct)","offer_id":48968243249440,"sku":"Pend_Fluorite_Rose_3","price":260.0,"currency_code":"USD","in_stock":false},{"title":"Round Cut (avg 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after fluorite. \u003c\/em\u003e\u003c\/p\u003e\n\u003cp\u003eThis Europium-doped fluorite is grown for science - these crystals are valuable because they are extremely sensitive to many kinds of radiation (not just UV), so can be used as 'scintillators' for detecting the presence of x-rays.  Eu:Fluorite's glow is strong enough to change its color in direct sunlight, shifting from clear and colorless to a refreshing blue.  (So blue, that it can get too bright and overwhelms our digital camera, turning the photo purple!)\u003c\/p\u003e\n\u003cp\u003eYou might be wondering \"why are fluorite gems is so rare when it's so cool?\" That's because fluorite is a really tricky material to cut.  It has low Moh's hardness (rank 4 on the scale), and on top of that has four perfect cleavage planes - it wants to break into perfect octahedrons.  Combined with one of the lowest refractive indexes of any gem, it requires extreme care when cutting - any mistake, and the gem can split in half.\u003c\/p\u003e\n\u003cp\u003eStill, I think the results speak for themselves - while these stones are a bit delicate (and not suitable for rings), the amazing glow is the brightest blue fluorescence I've seen from any stone, lab or natural.\u003c\/p\u003e","brand":"Turtle's Hoard","offers":[{"title":"4mm Round (avg. 0.2ct)","offer_id":48968280473888,"sku":"Gem_Fluorite_Rnd_4","price":8.0,"currency_code":"USD","in_stock":false},{"title":"4.5mm Round (avg. 0.35ct)","offer_id":50699564351776,"sku":"Gem_Fluorite_Rnd_4.5","price":14.0,"currency_code":"USD","in_stock":false},{"title":"5mm Round (avg. 0.5ct)","offer_id":48968304951584,"sku":"Gem_Fluorite_Rnd_5","price":20.0,"currency_code":"USD","in_stock":false},{"title":"5.5mm Round (avg. 0.65ct)","offer_id":50699564384544,"sku":"Gem_Fluorite_Rnd_5.5","price":26.0,"currency_code":"USD","in_stock":false},{"title":"6mm Round (avg. 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