I need a refractive index/reflectivity chart

Last Updated: Jun 18, 2012 06:10PM EDT

Note that a refractive index and/or reflectivity chart is included with every gemological refractometer we sell. You may reference the chart below, or download a chart at the bottom of this article.

  Gemstone Refractive Index Reflective Index on PRM / PDT

1 Actinolite 1.614 - 1.642 28 - 33
2 Albite Feldspar 1.525 - 1.536 22 - 25
3 Almandite Garnet 1.790 - 1.790 41 - 45
4 Amber 1.540 - 1.540 23 - 26
5 Andalusite 1.634 - 1.643 30 - 33
6 Andrdite Garnet (Demantoid) 1.875 - 1.875 47 - 52
7 Apatite 1.642 - 1.646 30 - 34
8 Benitoite 1.757 - 1.804 39 - 47
9 Beryl 1.577 - 1.583 26 - 29
10 Brazillanite 1.602 - 1.621 27 - 32
11 Calcite 1.486 - 1.658 20 - 35
12 Chalcedony 1.535 - 1.539 23 - 25
13 Chrysobery (Alexandrite) 1.746 - 1.755 38 - 42
14 Coral 1.486 - 1.658 20 - 35
15 Corundum (Sapphire only) 1.762 - 1.770 34 - 43
16 Cubic Zirconium Oxide 2.177 - 2.177 65 - 76
17 Danburite 1.630 - 1.636 29 - 33
18 Diamond 2.417 - 2.417 88 - 97
19 Diopside 1.675 - 1.701 33 - 38
20 Dioptase 1.655 - 1.708 31 - 39
21 Emerald 1.580 - 1.580 26 - 29
22 Fluorite 1.434 - 1.434 16 - 18
23 G.G.G 2.030 - 2.030 52 - 57
24 Glass 1.440 - 1.900 17 - 54
25 Hematite 2.940 - 3.220 124 - 157
26 Idocrase 1.713 - 1.718 35 - 39
27 Iolite (Cordierite) 1.542 - 1.551 23 - 27
28 Ivory 1.540 - 1.540 23 - 26
29 Jadeite 1.660 - 1.680 32 - 36
30 Jet 1.660 - 1.660 32 - 35
31 Kornerupine 1.667 - 1.680 32 - 36
32 Kyanite 1.716 - 1.731 36 - 41
33 Labradorite Feldspar 1.559 - 1.568 24 - 28
34 Lapis-Lazull (Lazurite) 1.500 - 1.500 20 - 23
35 Malachite 1.660 - 1.910 32 - 55
36 Microcline Feldspar 1.522 - 1.530 22 - 25
37 Moldavite 1.500 - 1.500 20 - 23
38 Nephrite 1.606 - 1.632 28 - 33
39 Obsidian 1.500 - 1.500 20 - 23





 

Gemstone Refractive Index Reflective Index on PRM / PDT
40 Oligoclase Feldspar 1.539 - 1.547 23 - 26
41 Opal 1.450 - 1.450 17 - 19
42 Orthoclase Feldspar (Moonstone) 1.518 - 1.526 22 - 25
43 Peridot 1.654 - 1.690 31 - 37
44 Plastic 1.460 - 1.700 18 - 38
45 Pyrope Garnet 1.746 - 1.746 38 - 42
46 Quartz 1.544 - 1.553 23 - 27
47 Rhodochrosite 1.597 - 1.817 27 - 48
48 Rhodolite Garnet 1.760 - 1.760 39 - 43
49 Rhodonite 1.730 - 1.740 37 - 41
50 Sapphire 1.670 - 1.770 32 - 44
51 Scapolite 1.550 - 1.572 24 - 28
52 Serpentine 1.560 - 1.570 25 - 28
53 Shell 1.530 - 1.686 22 - 37
54 Sinhalite 1.668 - 1.707 32 - 39
55 Sodalite 1.483 - 1.483 19 - 21
56 Spessartite Garnet 1.810 - 1.810 43 - 47
57 Sphene 1.900 - 2.034 49 - 66
58 Spinel 1.718 - 1.718 36 - 39
59 Spodumene (Kunzite) 1.660 - 1.676 32 - 36
60 Strontium Titanate 2.409 - 2.409 77 - 87
61 Synthetic Corundum 1.762 - 1.770 34 - 40
62 Synthetic Emerald (Flux) 1.561 - 1.564 25 - 27
63 Synthetic Emerald (Hydro) 1.568 - 1.573 25 - 28
64 Synthetic Moissanite 2.650 - 2.650 99 - 116
65 Synthetic Rutile 2.616 - 2.903 102 - 134
66 Synthetic Spinel 1.730 - 1.730 30 - 36
67 TL Grossularite Garnet 1.720 - 1.720 36 - 40
68 Topaz (Blue, White) 1.619 - 1.627 29 - 32
69 Tourmaline 1.624 - 1.644 29 - 34
70 TP Grossularite Garnet (Hessonite) 1.740 - 1.740 37 - 41
71 Turquoise 1.610 - 1.650 28 - 34
72 Verdite 1.580 - 1.580 26 - 29
73 Y.A.G. 1.833 - 1.833 41 - 46
74 Zircon (High) 1.925 - 1.984 51 - 62
75 Zircon (Low) 1.810 - 1.815 43 - 47
76 Zircon (Medium) 1.875 - 1.905 47 - 55
77 Zoisite (Tanzanite) 1.691 - 1.704 34 - 38