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They look a bit like alexandrite or color change garnet but is also totally different and unique. This is easily one of my favorite gems, unlike anything else found in nature or any other synthetic.\u003cbr\u003e\u003cbr\u003eCr:YAG is used in lasers as a 'q switch', which means it is opaque until it absorbs a critical amount of radiation and then suddenly becomes transparent. This allows a laser to charge its crystal up to a higher energy level before suddenly releasing it all in a single powerful\u003cspan\u003e \u003c\/span\u003eburst instead of shooting out in a continuous beam. Pulsed lasers can be extremely powerful and are incredibly useful for all sorts of applications, from tattoo removal to cutting edge physics research. 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these stones glow blue under shortwave UV because of titanium contamination.\u003cbr data-mce-fragment=\"1\"\u003e\u003cbr data-mce-fragment=\"1\"\u003eThis is a really cool material--lab sapphire grown for windows on the F35!  These aren't used on the cockpit but on a sensor array right below.  There are numerous sensors on the bottom of an F35 that allow for a 365 degree view in a wide spectral range.  With the incredible accelerations and speed that have to be withstood an ultra hard, ultra durable material like sapphire is needed.  But how do you make giant, flat sheets of sapphire?  Normally you'd cut windows out of a big round boule grown by HEM or kyropolis but the shape really isn't conducive to larger flat shapes.\u003c\/p\u003e\n\u003cp\u003eTo solve this problem Rubicon, at the time one of America's greatest sapphire growing companies, got a 5 million dollar grant to develop the LANCE furnace, an ultra high tech crystal growing machine that grows the world's largest flat 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below.  There are numerous sensors on the bottom of an F35 that allow for a 365 degree view in a wide spectral range.  With the incredible accelerations and speed that have to be withstood an ultra hard, ultra durable material like sapphire is needed.  But how do you make giant, flat sheets of sapphire?  Normally you'd cut windows out of a big round boule grown by HEM or \u003cspan class=\"ZNx93QP1XNrBdT5MI6SY\"\u003e\u003cspan class=\"expandableItem\"\u003eKyropoulos \u003c\/span\u003e\u003c\/span\u003ebut the shape really isn't conducive to larger flat shapes.\u003c\/p\u003e\n\u003cp\u003eTo solve this problem Rubicon, at the time one of America's greatest sapphire growing companies, got a 5 million dollar grant to develop the LANCE furnace, an ultra high tech crystal growing machine that grows the world's largest flat sapphires via the \"boat\" method aka HDSM.  If you've ever been to a Quiznos think of the ovens with a conveyor belt they use to toast subs evenly--it's basically that but with a giant flat pan of molten, crystallizing sapphire.\u003c\/p\u003e\n\u003cp\u003eThough the LANCE is absolutely incredible (we got to see it in person and meet the head crystal grower!!) it didn't have a 100% success rate, and over time the company built up a pile of defective sapphire crystals that had either been contaminated with titanium (which turns them pink and ruins UV transmission), developed bubbles, shattered during growth or usually all three.  They recently closed their factory in Chicago and auctioned off the contents, and we were able to buy the entire pile of defective crystals!  It was a dream come true!\u003cbr\u003e\u003c\/p\u003e","brand":"Turtle's Hoard","offers":[{"title":"Dangle Earrings, 8mm, 2.6tctw stones","offer_id":51480909185312,"sku":"Ear_EOTS_8x5.5","price":177.0,"currency_code":"USD","in_stock":true},{"title":"Stud Earrings, 8mm, ~6tctw round 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They are set in solid sterling silver.\u003cbr data-mce-fragment=\"1\"\u003e\u003cbr data-mce-fragment=\"1\"\u003eLuAG (Lutetium Aluminum Garnet) is a hyperfluorescent lab-created garnet which is used in science and medicine as a 'scintillator', a material whose fluorescence is so strong it can be used in detecting invisible radiation like x-rays and gamma rays. The way this is done is by cutting the garnet into square 'pixels', each of which is put in front of a sensor. When a gamma ray or x-ray hits one of the pixels they fluoresce and the sensor can detect the light, much like in a digital camera.\u003cbr data-mce-fragment=\"1\"\u003e\u003cbr data-mce-fragment=\"1\"\u003eThese stones don't just glow, they reach out and grab the eye when exposed to sunlight, diffuse skylight and even indoor lighting. They make incredible jewelry which is guaranteed to make a statement. These should be a great gift for any science-loving relative, fashionable radiologist, significant other, cyberpunk friend or of course for yourself. \u003cbr data-mce-fragment=\"1\"\u003e\u003cbr data-mce-fragment=\"1\"\u003ePlus, since we saved these crystals from the waste stream, this is a rare example of an upcycled gemstone.\u003cbr data-mce-fragment=\"1\"\u003e\u003cbr data-mce-fragment=\"1\"\u003eLuAG is more durable than natural garnets with a hardness of 8.5. Even normal room lights will make it fluoresce, and outdoors with indirect sunlight can make it look like it is photoshopped into real life. 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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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constant.\u003c\/p\u003e\n\u003cp\u003eWe currently have hearts in deep red lab ruby, lab laser alexandrite, vintage Djeva cobalt blue lab spinel, pink laser garnet (Nd:YAG), bright orange-glow cerium YAG grown to our custom formula, aqua-blue laser garnet (Yb:YAG) and vivid green laser garnet (V:YAG).\u003c\/p\u003e\n\u003cp\u003eLab ruby is the oldest lab grown gem, having first been made in the 1800s.  Its rich, deep red base color and vivid red fluorescence have made it an all-time classic, and it matches the shade of red seen in most classic games as well.\u003c\/p\u003e\n\u003cp\u003eLab alexandrite is grown for use in lasers--these hearts were made from offcuts of laser crystals.  They have a rich red glow and flashes of blue, green and purple depending on the lighting.\u003c\/p\u003e\n\u003cp\u003eCobalt spinel is probably the most vivid blue gem there is.  This is vintage material grown in Switzerland by the Djeva company and has the best color of any gem-grade cobalt spinel in my opinion, a deep, velvety vivid blue.\u003c\/p\u003e\n\u003cp\u003eVanadium YAG is a vivid green laser garnet which is used to turn a continuous-firing laser to a powerful pulsed laser.  It has maybe my favorite shade of green in a gem and makes for a very eye-grabbing stone.\u003c\/p\u003e\n\u003cp\u003eNeodymium YAG is the most classic laser crystal, used in systems for everything from medicine to rust removal.  It has a beautiful light violet color which shifts to pink, blueberry or colorless depending on the lighting.\u003c\/p\u003e\n\u003cp\u003eOrange glow lumogarnet (ie special cerium YAG) is a special formulation of garnet we had grown for us.  Like normal cerium-doped YAG it has a vivid yellow base color and ultra strong fluorescence, but this material has a more orange-leaning fluorescent color which gives it an extra snap.\u003c\/p\u003e","brand":"Turtle's Hoard","offers":[{"title":"Lab Ruby \/ RetroHeart™ Pendant 5mm 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Note the camera can't capture the true color!  There is a red glow to these stones thanks to their strong fluorescence but it doesn't dominate like it does in the photos.  These gems have flashes of red, blue and purple depending on the lighting that shift and swirl as the stone is turned.\u003c\/p\u003e\n\u003cp\u003eWe recently got our hands on a few alexandrite crystal heads!  When alexandrite crystals are grown the top region is less pure and often has some bubbles which require it to be removed before they cut the rest of the crystal into laser rods.  Fortunately it is possible to trim out pieces that are great for gem usage even if they weren't quite laser grade.  These stones are really cool to look at!  Their color change is strong, and shows up under different kinds of LEDs and even from looking at them with the center of your vision vs the edge. 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Usually instead lab-created sapphire with a color change effect was sold as alexandrite, but that material really can't hold a candle to alexandrite.\u003cbr\u003e\u003c\/p\u003e","brand":"Turtle's Hoard","offers":[{"title":"Pendant with Fantasy Cut 10mm Round","offer_id":51488145965344,"sku":"Pnd_AlexFant_Rnd10","price":499.0,"currency_code":"USD","in_stock":false},{"title":"Pendant with 10mm Standard Round","offer_id":51488145998112,"sku":"Pnd_Alex_Rnd10","price":465.0,"currency_code":"USD","in_stock":true},{"title":"Stud Earrings with 8mm Rounds (pair)","offer_id":51488146030880,"sku":"Stud_Alex_Rnd8","price":387.0,"currency_code":"USD","in_stock":true},{"title":"Pendant with 12x8mm Pixel Cut","offer_id":51488382779680,"sku":"Pnd_Alex_Pixel12x8","price":629.0,"currency_code":"USD","in_stock":true},{"title":"Dangle Earrings with 8mm Rounds (pair)","offer_id":51819620991264,"sku":"Ear_Alex_Dangle_Rnd8","price":456.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/6794\/0384\/files\/Round_Alexandrite_Pendant.jpg?v=1774236179"},{"product_id":"retrohex-jewelry-laser-garnet-and-more","title":"RetroHex™ Jewelry, Laser Garnet and More","description":"\u003cp\u003e\u003cspan\u003eThis jewelry is set with various lab-grown gems cut in our long hexagon RetroHex™ cuts! 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Silver","description":"\u003cp\u003e\u003cspan\u003eThese sterling silver bracelets use lab created sapphires which were grown for sensor windows in the F35 fighter jet, which didn't quite meet spec.  They've been faceted in my custom EOTS design, shaped like sapphire sensor cluster on the nose of the F-35.\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eNote these stones glow blue under shortwave UV because of titanium contamination.\u003cbr\u003e\u003cbr\u003eThis is a really cool material--lab sapphire grown for windows on the F35!  These aren't used on the cockpit but on a sensor array right below.  There are numerous sensors on the bottom of an F35 that allow for a 365 degree view in a wide spectral range.  With the incredible accelerations and speed that have to be withstood an ultra hard, ultra durable material like sapphire is needed.  But how do you make giant, flat sheets of sapphire?  Normally you'd cut windows out of a big round boule grown by HEM or \u003cspan class=\"ZNx93QP1XNrBdT5MI6SY\"\u003e\u003cspan class=\"expandableItem\"\u003eKyropoulos \u003c\/span\u003e\u003c\/span\u003ebut the shape really isn't conducive to larger flat shapes.\u003c\/p\u003e\n\u003cp\u003eTo solve this problem Rubicon, at the time one of America's greatest sapphire growing companies, got a 5 million dollar grant to develop the LANCE furnace, an ultra high tech crystal growing machine that grows the world's largest flat sapphires via the \"boat\" method aka HDSM.  If you've ever been to a Quiznos think of the ovens with a conveyer belt they use to toast subs evenly--it's basically that but with a giant flat pan of molten, crystallizing sapphire.\u003c\/p\u003e\n\u003cp\u003eThough the LANCE is absolutely incredible (we got to see it in person and meet the head crystal grower!!) it didn't have a 100% success rate, and over time the company built up a pile of defective sapphire crystals that had either been contaminated with titanium (which turns them pink and ruins UV transmission), developed bubbles, shattered during growth or usually all three.  They recently closed their factory in Chicago and auctioned off the contents, and we were able to buy the entire pile of defective crystals!  It was a dream come true!\u003c\/p\u003e","brand":"Turtle's Hoard","offers":[{"title":"Black Leather EOTS Bracelet, 8mm stone","offer_id":51480909709600,"sku":"Brc_EOTS_8x5.5","price":196.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/6794\/0384\/files\/EOTS_F35_Sapphire_Bracelet.jpg?v=1776892082"},{"product_id":"faceted-gagg-jewelry-yellow-gadolinium-aluminum-gallium-garnet-cerium","title":"Faceted GAGG Jewelry (Earrings and Pendants of Yellow Gadolinium Aluminum Gallium Garnet: Cerium)","description":"\u003cp\u003eThese sterling silver earrings and pendants are cut from GAGG jewelry!  While they have varying amounts of visible yellow afterglow, it isn't extreme enough to be 'high glow' material.  You'll see it in a pitch black room after UV charging but don't expect much beyond that.\u003c\/p\u003e\n\u003cp\u003eNote some of the stones have bubbles or other imperfections--these typically contribute to the phosphorescence.\u003c\/p\u003e\n\u003cp\u003eGAGG is a type of hyperfluorescent lab created garnet produced for use as scintillators in PET scanners, CAT scanners or similar devices.  \u003c\/p\u003e\n\u003cp\u003eCerium GAGG is a material which has recently risen to prominence in industry but never been used as a gem until now. It is what we call a 'lumogarnet' - a synthetic garnet with incredible fluorescence. It glows a bright yellow, slightly greener and brighter than already-bright Ce:YAG. This material is like an upgraded version of the classic GGG crossed with an aluminum garnet (like YAG and LuAG) to give it excellent hardness (8) while maintaining a high RI (1.9) and generally excellent gem properties. \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Turtle's Hoard","offers":[{"title":"Round Pendant 10mm ~8.5ct","offer_id":51530300850464,"sku":"Pend_GAGG_PXL12x8","price":450.0,"currency_code":"USD","in_stock":true},{"title":"Pixel Pendant 12x8mm ~8.8ct","offer_id":51531029086496,"sku":"Pend_GAGG_RND10","price":520.0,"currency_code":"USD","in_stock":true},{"title":"Stud Earrings 8mm ~8.8tctw","offer_id":51531029119264,"sku":"Stud_GAGG_8mm","price":480.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/6794\/0384\/files\/Faceted_GAGG_Jewelry_Sterling.jpg?v=1777270907"},{"product_id":"soviet-ruby-jewelry","title":"Soviet Ruby Pendants","description":"\u003cp\u003eThese are lab created rubies produced in the Soviet Union back in the 1970s or 1980s, cut from an old collection and set in 925 sterling silver. Some of the original lab ruby rough was grown from the pink pure chromium formulas originally intended for lasers, but others are definitely using the jewelry ruby formulas instead, which add codopants for richer red color (some of the magenta rubies seem to have added titanium, for instance).  \u003c\/p\u003e\n\u003cp\u003eThey are great for any lover of science, history or the color pink.\u003c\/p\u003e","brand":"Turtle's Hoard","offers":[{"title":"Red Ruby Square Pendant, 12.4mm","offer_id":51815125516576,"sku":"pend_ruby_00120260609","price":270.0,"currency_code":"USD","in_stock":false},{"title":"Magenta Ruby Oval Pendant, 19×13.2mm","offer_id":51815125549344,"sku":"pend_ruby_00220260609","price":343.0,"currency_code":"USD","in_stock":true},{"title":"Magenta Ruby Oval Pendant (With Inclusions), 19.7×14.3mm","offer_id":51815125582112,"sku":"pend_ruby_00320260609","price":315.0,"currency_code":"USD","in_stock":true},{"title":"Pink Ruby Oval Pendant, 17×12.9mm","offer_id":51815125614880,"sku":"pend_ruby_00420260609","price":322.0,"currency_code":"USD","in_stock":true},{"title":"Pink Ruby Oval Pendant, 20.1×13.1mm","offer_id":51815125647648,"sku":"pend_ruby_00520260609","price":374.0,"currency_code":"USD","in_stock":true},{"title":"Pink Ruby Oval Pendant, 19×13.1mm","offer_id":51815125680416,"sku":"pend_ruby_00620260609","price":349.0,"currency_code":"USD","in_stock":true},{"title":"Pink Ruby Round Pendant, 16mm","offer_id":51815125713184,"sku":"pend_ruby_00720260609","price":385.0,"currency_code":"USD","in_stock":true},{"title":"Pink Ruby Round Pendant, 17mm","offer_id":51815125745952,"sku":"pend_ruby_00820260609","price":456.0,"currency_code":"USD","in_stock":true},{"title":"Pink Ruby Pixel Pendant, 15×10.1mm","offer_id":51815125778720,"sku":"pend_ruby_00920260609","price":250.0,"currency_code":"USD","in_stock":true},{"title":"Pink Ruby Pixel Pendant, 14.8×9.8mm","offer_id":51815125811488,"sku":"pend_ruby_01020260609","price":247.0,"currency_code":"USD","in_stock":true},{"title":"Pink Ruby Pixel Pendant, 15×9.9mm","offer_id":51815125844256,"sku":"pend_ruby_01120260609","price":247.0,"currency_code":"USD","in_stock":true},{"title":"Pink Ruby Pixel Pendant, 15.1×9.9mm","offer_id":51815125877024,"sku":"pend_ruby_01220260609","price":259.0,"currency_code":"USD","in_stock":true},{"title":"Pink Ruby Pixel Pendant, 15.6×10.9mm","offer_id":51815125909792,"sku":"pend_ruby_01320260609","price":280.0,"currency_code":"USD","in_stock":true},{"title":"Pink Ruby Pixel Pendant, 14.6×10.8mm","offer_id":51864546705696,"sku":"pend_ruby_01420260609","price":308.0,"currency_code":"USD","in_stock":true},{"title":"Light Pink Ruby Cushion Pendant, 14.8×12.6mm","offer_id":51864546738464,"sku":"pend_ruby_01520260609","price":342.0,"currency_code":"USD","in_stock":true},{"title":"Pink Ruby Trillion Pendant, 18.5mm","offer_id":51864546771232,"sku":"pend_ruby_01620260609","price":562.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/6794\/0384\/files\/Ruby_Pendants_Front_Photo.jpg?v=1781071072"},{"product_id":"erbium-laser-garnet-pendants-in-sterling-silver-yag-er-jewelry","title":"Erbium Laser Garnet Pendants in Sterling Silver (YAG:Er Jewelry)","description":"\u003cp\u003e\u003cspan\u003eThese are faceted Er:YAG (Yttrium Aluminum Garnet) Pendants in 925 Sterling Silver\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eUsed in lasers, Erbium YAG has a very strong color change, and will go from orange to pink depending on lighting.  Depending on the lightbulb type (even changing between different LEDs), or when illuminated by computer monitors or phone screens, the gem keeps shifting.  It's e\u003c\/span\u003e\u003cspan\u003easily visible under real world lighting conditions so the stones look different throughout your daily routine.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eThis extends to phone cameras as well - one of these might look pink to the eye and yellow to your phone!\u003cbr\u003e\u003cbr\u003e\u003cspan\u003eWith a hardness of 8.5 it is ideal for use in jewelry.\u003c\/span\u003e\u003c\/p\u003e","brand":"Turtle's Hoard","offers":[{"title":"Square Cushion, 13.1mm","offer_id":51866333708576,"sku":"pend_yager_00120260615","price":325.0,"currency_code":"USD","in_stock":true},{"title":"Square Cushion, 12.7mm","offer_id":51866333741344,"sku":"pend_yager_00220260615","price":323.0,"currency_code":"USD","in_stock":true},{"title":"Rectangular Cushion, 14.8×13mm","offer_id":51866333774112,"sku":"pend_yager_00320260615","price":431.0,"currency_code":"USD","in_stock":true},{"title":"Rectangular Cushion, 15.2×13.1mm","offer_id":51866333806880,"sku":"pend_yager_00420260615","price":453.0,"currency_code":"USD","in_stock":true},{"title":"Rectangular Cushion, 15×12.8mm","offer_id":51866333839648,"sku":"pend_yager_00520260615","price":418.0,"currency_code":"USD","in_stock":true},{"title":"Oval, 18.2×14.1mm","offer_id":51866333872416,"sku":"pend_yager_00620260615","price":451.0,"currency_code":"USD","in_stock":true},{"title":"Pixel, 14x10mm, Branched Setting","offer_id":51866333905184,"sku":"pend_yager_PXL14x11","price":274.0,"currency_code":"USD","in_stock":true},{"title":"Thin Bailed Pixel, 14x10mm","offer_id":51866333937952,"sku":"pend_yager_00720260615","price":256.0,"currency_code":"USD","in_stock":true},{"title":"Chipped Pixel, 14x10mm","offer_id":51866333970720,"sku":"pend_yager_00820260615","price":204.0,"currency_code":"USD","in_stock":true},{"title":"Pixel with Fracture, 14x10mm","offer_id":51866334003488,"sku":"pend_yager_00920260615","price":226.0,"currency_code":"USD","in_stock":true},{"title":"Pixel, 15x11 mm, Geometric Setting","offer_id":51866334036256,"sku":"pend_yager_PXL15x11","price":304.0,"currency_code":"USD","in_stock":true},{"title":"Pixel, 15x11 mm, Branched Setting","offer_id":51866334069024,"sku":"pend_yager_01020260615","price":342.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/6794\/0384\/files\/YAG_Er_Pendant_Color_Change.jpg?v=1781675129"}],"url":"https:\/\/store.gemsofscience.com\/collections\/jewelry.oembed?page=2","provider":"Gems Of Science","version":"1.0","type":"link"}