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This is pure Nd:YAG
They've been faceted and set in solid sterling silver jewelry
These are faceted Er:YAG (Yttrium Aluminum Garnet)
Note its hardness is 5
Cerium GAGG is brand new as far as gems go--it only entered industrial usage in 2014
F-35 Fighter Jet Window Sapphire Facet Rough and Shards (F35 Gem) Size:F-35 Rough 8-9g This is pure Nd:YAGThese are chunks of lab created sapphire which were grown for use as sensor windows in the F35 fighter jet but didn't meet spec. These pieces may have cracks or bubbles and may also show light pink coloration. A couple pieces still have some of the molybdenum crucible attached. THESE CAN BE SHARP! HANDLE WITH CARE!!!! This 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