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The rod measures 15
BGO-20 is 80% as dense as a chunk of lead
with an RI of 2
one of our cutters came across some material and really wanted to cut it
so there was an obvious difference when cut
Rough TGG Lab Garnet, Rare Magnetic Scientific Crystal Size:7-8g The rod measures 15This is rough terbium gallium garnet aka TGG. Rough pieces are sorted by gram size, with representative photos of crystals on a 1 mm grid. TGG is a very cool synthetic material. It has the same structure as a natural garnet, but has a composition that would never be possible in nature. The result is a bright and very dispersive gem with optical properties similar to diamond (cubic crystal structure with a lower RI but the same dispersion as diamond),