Xylem E-Line Gemological Refractometer - Manual (Page 6)

Typical Refractive Index values Gemstones
Agate 1.544 - 1.553 Jade, Nephrite 1.600 - 1.641
Alexandrite 1.746 - 1.755 Jet 1.660
Almandine 1.750 - 1.830 Pearl 1.530 - 1.690
Amber 1.539 - 1.545 Peridot 1.635 - 1.690
Amethyst 1.532 - 1.554 Quartz 1.544 - 1.553
Ammolite 1.520 - 1.680 Ruby 1.757 - 1.779
Andalusite 1.629 - 1.650 Sapphire 1.757 - 1.779
Apatite 1.632 - 1.420 Sapphire, Star 1.760 - 1.773
Aquamarine 1.567 - 1.590 Spessarite 1.790 - 1.810
Axenite 1.674 - 1.704 Spinel 1.712 - 1.717
Beryl 1.570 - 1.60 Spinel, Blue 1.712 - 1.747
Beryl, Red 1.570 - 1.598 Spinel, Red 1.708 - 1.735
Chalcedony 1.544 - 1.553 Star Ruby 1.760 - 1.773
Chrome Tourmaline 1.610 - 1.640 Tanzanite 1.690 - 1.700
Citrine 1.532 - 1.554 Topaz 1.607 - 1.627
Clinohumite 1.625 - 1.675 Topaz, Imperial 1.605 - 1.640
Coral 1.486 - 1.658 Tourmaline 1.603 - 1.655
Crystal 2.000 Tourmaline, Blue 1.610 - 1.640
Crysoberyl, Catseye 1.746 - 1.755 Tourmaline, Catseye 1.610 - 1.640
Danburite 1.627 - 1.641 Tourmaline, Green 1.610 - 1.640
Diamond 2.417 Tourmaline, Paraiba 1.610 - 1.650
Emerald 1.560 - 1.605 Tourmaline, Red 1.610 - 1.640
Emerald Catseye 1.560 - 1.605 Zircon 1.777 - 1.987
Flourite 1.434 Zirconia, Cubic 2.173 - 2.210
Garnet, Grossular 1.720 - 1.800 Kunzite 1.660 - 1.676
Garnet, Andradite 1.880 - 1.940 Labradorite 1.560 - 1.572
Garnet, Demantiod 1.880 - 1.900 Lapis Lazuli 1.500 - 1.550
Garnet, Mandarin 1.790 - 1.800 Moonstone 1.518 - 1.526
Garnet, Pyrope 1.730 - 1.760 Morganite 1.585 - 1.594
Garnet, Rhodolite 1.740 - 1.770 Obsidian 1.500
Garnet, Tsavorite 1.739 - 1.744 Opal, Black 1.440 - 1.460
Garnet, Uvarovite 1.740 - 1.870 Opal, Fire 1.430 - 1.460
Hauyn 1.490 - 1.505 Opal, White 1.440 - 1.460
Iolite 1.522 - 1.578 Oregon Sunstone 1.560 - 1.572
Jade, Jadeite 1.640 - 1.667 Padparadja 1.760 - 1.773
The above table is a guide only. Bellingham+Stanley does not take any responsibility due to loss or
damage caused by use of data contained in this instruction manual.
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