Refraction Index of Various Substances for 3D Gemstones Agate 1.544 - 1.553 Alexandrite 1.746 - 1.755 Almandine 1.75 - 1.83 Amber 1.539 - 1.545 Amethyst 1.532 - 1.554 Ammolite 1.52 -1.68 Andalusite 1.629 - 1.650 Apatite 1.632 - 1.42 Aquamarine 1.567-1.590 Axenite 1.674 - 1.704 Beryl 1.57 - 1.60 Beryl, Red 1.570 - 1.598 Chalcedony 1.544 - 1.553 Chrome Tourmaline, 1.61 - 1.64 Citrine 1.532 - 1.5..
