GEM VARIETY |
R.I. |
BIREFRINGENCE |
Hematine |
2.940 - 3.220 |
0.287 |
Moissanite |
2.650 - 2.690 |
0.043 |
Diamond |
2.417 - 2.419 |
None |
Cubic Zirconia |
2.15 - 2.18 |
None |
Demantoid |
1.88 - 1.94 |
None |
Uvarovite |
1.865 |
None |
Zircon |
1.810 - 2.024 |
0.002 - 0.059 |
Spessartine |
1.790 - 1.820 |
None |
Almandine |
1.770 - 1.820 |
None |
Ruby |
1.762 - 1.778 |
0.008 |
Sapphire |
1.762 - 1.778 |
0.008 |
Alexandrite |
1.746 - 1.763 |
0.007 - 0.011 |
Chrysoberyl |
1.746 - 1.763 |
0.007 - 0.011 |
Cat's Eye |
1.746 - 1.763 |
0.007 - 0.011 |
Rhodolite |
1.742 - 1.785 |
None |
Color Change Garnet |
1.742 - 1.780 |
None |
Tsavorite |
1.734 - 1.759 |
None |
Hessonite |
1.730 - 1.757 |
None |
Azurite |
1.720 - 1.848 |
0.108 - 0.110 |
Pyrope |
1.720 - 1.756 |
None |
Spinel |
1.712 - 1.782 |
None |
Tanzanite |
1.691 - 1.700 |
0.009 |
Diopside |
1.664 - 1.730 |
0.024 - 0.031 |
Kunzite |
1.660 - 1.681 |
0.014 - 0.016 |
Malachite |
1.666 - 1.909 |
0.254 |
Jadeite |
1.652 - 1.688 |
0.020 |
Peridot |
1.650 - 1.703 |
0.036 - 0.038 |
Jet |
1.640 - 1.680 |
None |
Apatite |
1.628 - 1.649 |
0.002 - 0.006 |
Andalusite |
1.627 - 1.649 |
0.007 - 0.013 |
Tourmaline |
1.614 - 1.666 |
0.014 - 0.032 |
Gaspeite |
1.610 - 1.810 |
0.220 |
Turquoise |
1.610 - 1.650 |
0.040 |
Topaz |
1.609 - 1.643 |
0.009 - 0016 |
Sugilite |
1.607 - 1.611 |
0.001 - 0.004 |
Rhodochrosite |
1.600 - 1.820 |
0.208 - 0.220 |
Nephrite |
1.600 - 1.627 |
0.027 |
Howlite |
1.586 - 1.605 |
0.019 |
Emerald |
1.565 - 1.602 |
0.005 |
Aquamarine |
1.565 - 1.602 |
0.005 |
Morganite |
1.562 - 1.605 |
0.004 - 0.010 |
Heliodor |
1.562 - 1.605 |
0.004 - 0.010 |
Bixbite |
1.562 - 1.605 |
0.004 - 0.010 |
Goshenite |
1.562 - 1.605 |
0.004 - 0.010 |
Labradorite |
1.559 - 1.570 |
0.008 - 0.010 |
Charoite |
1.550 - 1.561 |
0.004 - 0.009 |
Amethyst |
1.544 - 1.553 |
0.009 |
Aventurine |
1.544 - 1.553 |
0.009 |
Ametrine |
1.544 - 1.553 |
0.009 |
Citrine |
1.544 - 1.553 |
0.009 |
Rock Crystal |
1.544 - 1.553 |
0.009 |
Rose Quartz |
1.544 - 1.553 |
0.009 |
Smoky Quartz |
1.544 - 1.553 |
0.009 |
Iolite |
1.542 - 1.578 |
0.008 - 0.012 |
Jasper |
1.54 |
None |
Amber |
1.539 - 1.545 |
None |
Agate |
1.530 - 1.540 |
0.004 - 0.009 |
Bloodstone |
1.530 - 1.540 |
0.004 - 0.009 |
Chalcedony |
1.530 - 1.540 |
0.004 - 0.009 |
Carnelian |
1.530 - 1.540 |
0.004 - 0.009 |
Chrysoprase |
1.530 - 1.540 |
0.004 - 0.009 |
Onyx |
1.530 - 1.540 |
0.004 - 0.009 |
Sunstone |
1.525 - 1.548 |
0.010 |
Amazonite |
1.522 - 1.530 |
0.008 |
Pearl |
1.52 - 1.69 |
0.1.58 |
Moonstone |
1.518 - 1.528 |
0.008 |
Lapis Lazuli |
1.500 |
None |
Coral |
1.486 - 1.658 |
0.160 - 0.172 |
Moldavite |
1.48 - 1.54 |
None |
Sodalite |
1.48 |
None |
Chrysocolla |
1.46 - 1.57 |
0.023 - 0.040 |
Obsidian |
1.45 - 1.55 |
None |
Fluorite |
1.434 |
None |
Fire Opal |
1.37 - 1.52 |
None |
Opal |
1.37 - 1.52 |
None |