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with an RI of 2
Rutile has by far the highest dispersion of any gemstone worth the name which means it splits light into its component spectrum
so there was an obvious difference when cut
The rod measures 15
It's a great way to show that you're a fan of Gems of Science and of Turtle's Hoard
Rough TGG Lab Garnet, Rare Magnetic Scientific Crystal Size:7-8g with an RI of 2This 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),