Celluloid BLUE 2 1.38 1.50 Opal BLUE 6 2.10 1.45 Sodalite BLUE 5.5 2.30 1.48 Leucite BLUE 6 2.47 1.495 Iolite BLUE 7 2.59 1.53 Chalcedony.dyed BLUE 6.5 2.60 1.53 Quartz dyed BLUE 7 2.65 1.55 Aquamarine BLUE 7.5 2.69 1.57 Labradorite BLUE 6 2.70 1.559 Scapolite BLUE 5.00 2.70 1.55 Calcite dyed BLUE 3 2.71 1.486 Turquoise BLUE 6 2.80 1.62 Lapis Lazuli BLUE 5.5 2.80 1.50 Nephrite BLUE 5.00 2.96 1.606 Tourmaline BLUE 7.5 3.06 1.62 Lazulite BLUE 5.75 3.09 1.612 Fluorite BLUE 4 3.18 1.434 Spodumene BLUE 6.75 3.18 1.66 Apatite BLUE 5 3.21 1.64 Diamond BLUE 10 3.52 2.42 Spinel BLUE 8 3.60 1.72 Spinel (synth) BLUE 8 3.63 1.73 Benitoite BLUE 6.25 3.67 1.757 Kyanite BLUE 5.00 3.68 1.716 Chrysoberyl BLUE 8.5 3.71 1.74 Corundum BLUE 9 3.99 1.76 Rutile (synth) BLUE 6.5 4.25 2.62 Smithsonite BLUE 5.5 4.35 1.621 Zircon (blue) BLUE 7.5 4.69 1.92 Alabaster GREY 2 2.32 1.53 Bakelite GREY 2.5 1.28 1.65 Casein GREY 2.5 1.33 1.55 Celluoid GREY 2 1.35 1.50 Chalcedony GREY 7 2.62 1.53 Ivory GREY 2.5 1.80 1.54 Marble GREY 3 2.71 1.50 Meerschaum GREY 2 1.50 1.53 Quartz GREY 7 2.65 1.55 Opal GREY 6 2.10 2.10 Quartz GREY 7 3.33 2.65 Labradorite GREY 6 2.7 2.70 Calcite GREY 3 2.7 2.71 Talc GREY 1 2.70 2.75 Nephrite GREY 3.5 3.00 2.96 Jadeite GREY 7 3.34 3.33 Diamond GREY 10 3.52 3.52 Corundum GREY 9 3.99 3.99 Hematite GREY 6 5.10 5.05 Almandite Garnet PURPLE 7.5 4.2 1.80 Andalusite PURPLE 7.5 3.5 1.635 Amethyst PURPLE 7 2.65 1.54 Apatite PURPLE 5 3.2 1.638 Axinite PURPLE 7 3.29 1.69 Azurite PURPLE 3.75 3.8 1.79 Beryl (Morganite) PURPLE 7.5 2.7 1.58 Corundum (sapphire) PURPLE 9 4 1.764 Diamond PURPLE 10 3.515 2.418 Diopside PURPLE 5.00 3.29 1.69 Dumortierite PURPLE 7 3.3 1.68 Fluorite PURPLE 4 3.18 1.434 Iolite PURPLE 7 2.63 1.535 Quartz (Amethyst) PURPLE 7 2.65 1.548 Rhodolite Garnet PURPLE 7.5 3.6 1.73 Scapolite PURPLE 6 2.7 1.555 Spinel PURPLE 8 3.6 1.717 Synth spinel PURPLE 8 3.52 1.728 Spodumene (Kunzite) PURPLE 6.5 3.18 1.67 Taaffeite PURPLE 8 3.61 1.72 Topaz PURPLE 8 3.53 1.63 Tourmaline PURPLE 7.5 3.06 1.63 Zircon PURPLE 7.5 4.69 1.95 Zoisite PURPLE 6.5 3.35 1.695 Almandite Garnet PURPLE 7.5 4.05 1.79 Jadeite PURPLE 6.75 3.34 1.67 Quartz PURPLE 7 2.66 1.548 Stichtite PURPLE 1.75 2.16 1.53 Fire Opal RED 6 2.00 1.45 Chalcedony RED 6.75 2.60 1.54 Scapolite (pink) RED 6.5 2.63 1.56 Quartz RED 7 2.65 1.54 Coral RED 3.5 2.68 1.57 Beryl morganite RED 7.5 2.71 1.58 Scapolite RED 6.5 2.70 1.56 Pyrope RED 7.25 3.78 1.746 Pollucite RED 6.5 2.92 1.525 Phenakite RED 7.75 2.96 1.66 Danburite RED 7 3.00 1.63 Tourmaline RED 7.5 3.08 1.63 Andalusite RED 7.25 3.15 1.64 Fluorite RED 4 3.18 1.434 Apatite RED 5 3.21 1.64 Zoisite thulite RED 6.00 3.34 1.70 Rhodonite RED 6 3.54 1.72 Epidote RED 6.00 3.45 1.75 Diamond RED 10 3.52 2.42 Topaz (yellow) RED 8 3.53 1.63 Rhodochrosite RED 4 3.60 1.80 Spinel RED 8 3.60 1.72 Spinel (synth) RED 8 3.63 1.73 Benitoite RED 6.25 3.67 1.78 Chrysoberyl RED 8.5 3.71 1.75 Corundum RED 9 3.99 1.77 Painite RED 8 4.01 1.80 Sphalerite RED 3.75 4.09 2.37 Zircon RED 7.5 4.50 1.95 Spessartine RED 7.25 4.16 1.81 Cubic Zirconia RED 8 5.75 2.15 Cassiterite RED 6.00 6.90 2.04 GGG RED 6.5 7.05 2.02 Ivory WHITE 2.5 1.80 1.54 Alabaster WHITE 2 2.32 1.53 Bakelite WHITE 2.5 1.28 1.65 Casein WHITE 2.5 1.33 1.55 Celluoid WHITE 2 1.35 1.50 Chalcedony WHITE 7 2.62 1.53 Coral WHITE 3.5 2.68 1.565 Marble WHITE 3 2.71 1.50 Meerschaum WHITE 2 1.50 1.53 Pearl WHITE 3.5 2.70 1.57 Quartz WHITE 7 2.65 1.55 Opal WHITE 6 2.10 2.10 Labradorite WHITE 6 2.7 2.70 Calcite WHITE 3 2.7 2.71 Talc WHITE 1 2.70 2.75 Nephrite WHITE 3.5 3.00 2.96 Jadeite WHITE 7 3.34 3.33 Diamond WHITE 10 3.52 3.52 Corundum WHITE 9 3.99 3.99 Garnet BLACK 6.75 3.84 1.885 Black Coral BLACK 3.75 1.35 1.57 Chalcedony BLACK 6.75 2.6 1.54 Corundum BLACK 9 4.0 1.77 Diopside BLACK 5.00 3.29 1.69 Diamond BLACK 10 3.52 2.417 Hematite BLACK 6.00 5.2 3.00 Nephrite BLACK 6.25 2.95 1.62 Jadeite BLACK 6.75 3.32 1.67 Jet BLACK 3.25 1.32 1.66 Labradorite BLACK 6.25 2.7 1.56 Obsidian BLACK 5.25 2.4 1.5 Opal BLACK 5.75 2.15 1.45 Pearl BLACK 3.25 2.7 1.57 Tourmaline BLACK 7.25 3.06 1.63 Amber BROWN 2.25 1.08 1.54 Anatase BROWN 5.75 3.9 2.52 Andalusite BROWN 7.25 3.18 1.64 Apatite BROWN 5 3.18 1.64 Axinite BROWN 6.75 3.29 1.68 Beryl BROWN 7.75 2.7 1.58 Blend BROWN 3.2 4.09 2.37 Cassiterite BROWN 6.00 6.95 2.04 Chrysoberyl BROWN 8.5 3.72 1.75 Copal BROWN 2 1.06 1.54 Corundum BROWN 9 4 1.77 Diamond BROWN 10 3.52 2.417 Fluorite BROWN 4 3.18 1.434 Grossularite BROWN 7 3.61 1.735 Idocrase BROWN 6.5 3.4 1.72 Kornerupine BROWN 6.5 3.3 1.67 Labradorite BROWN 6 2.7 1.56 Obsidian BROWN 5 2.45 1.5 Opal (fire) BROWN 5.75 2 1.45 Peridot BROWN 6.00 3.34 1.67 Quartz BROWN 7 2.66 1.544/3 Synth Rutile BROWN 6.25 4.26 2.76 Sinhalite BROWN 6.00 3.45 1.69 Scheelite BROWN 5 6.12 1.93 Spessartite BROWN 7.25 4.15 1.81 Sphalerite BROWN 3.75 4.05 2.37 Sphene BROWN 5.25 3.52 1.97 Spinel BROWN 8 3.6 1.718 Staurolite BROWN 7.25 3.75 1.74 Topaz BROWN 8 3.53 1.62 Tourmaline BROWN 7.25 3.07 1.63 Willemite BROWN 5.5 4 1.71 Zircon(high) BROWN 7.25 4.7 1.95 Amblygonite COLORLESS 6 3.02 1.62 Apatite COLORLESS 5 3.20 1.64 Augalite COLORLESS 4 2.7 1.58 Benitoite COLORLESS 6.25 3.67 1.78 Beryl COLORLESS 7.75 2.70 1.58 Beryllonite COLORLESS 5.75 2.83 1.56 Brazilianite COLORLESS 5.5 2.99 1.61 Corundum COLORLESS 9 3.98 1.77 Danburite COLORLESS 7 3 1.63 Diamond COLORLESS 10 3.51 2.417 Euclase COLORLESS 7.5 3.1 1.665 Fluorite COLORLESS 4 3.18 1.434 Feldspar COLORLESS 6.25 2.59 1.53 GGG COLORLESS 6.5 7.02 2.02 Grossularite COLORLESS 7 3.61 1.735 Hambergite COLORLESS 7.5 2.35 1.59 Jadeite COLORLESS 6.75 3.34 1.67 Labradorite COLORLESS 6 2.7 1.56 Leucite COLORLESS 6 2.5 1.495 Opal COLORLESS 5.75 2.09 1.45 Petalite COLORLESS 6.25 2.4 1.51 Phenakite COLORLESS 7.75 2.95 1.66 Quartz COLORLESS 7 2.66 1.55 Rhodizite COLORLESS 8 3.4 1.69 Rutile(synth) COLORLESS 6.25 4.25 2.76 Scapolite COLORLESS 6.5 2.68 1.56 Scheelite COLORLESS 5 6.12 1.93 Spinel COLORLESS 8 3.6 1.718 Synth.Spinel COLORLESS 8 3.64 1.73 Strontium COLORLESS 5.00 5.13 2.409 spodumene COLORLESS 6.00 3.18 1.67 Topaz COLORLESS 8 3.53 1.63 Tourmaline COLORLESS 7.25 3.12 1.63 Zircon COLORLESS 7.5 4.35 1.90 Opal GREEN 6.00 2.45 1.45 Beryl GREEN 7.75 2.71 1.566 Chrysoberyl GREEN 8.5 3.7 1.75 Synth alex GREEN 8.5 3.7 1.75 Corundum GREEN 9 4 1.77 Diamond GREEN 10 3.52 2.417 Grossularite GREEN 7 3.61 1.735 Peridot GREEN 6.75 3.34 1.67 Chalcedony GREEN 6.75 2.6 1.54 Quartz GREEN 7 2.66 1.55 Spinel GREEN 8 3.6 1.718 Topaz GREEN 8 3.53 1.61 Tourmaline GREEN 7.25 3.06 1.63 Zircon GREEN 7.00 4.51 1.90 Andalusite GREEN 7.25 3.17 1.64 Brazilianite GREEN 5.5 2.94 1.61 Datolite GREEN 5.25 2.95 1.65 Ekanite GREEN 6.25 3.28 1.597 Enstatite GREEN 5.5 3.25 1.66 Epidote GREEN 6.00 3.4 1.75 Euclase GREEN 7.5 3.1 1.66 Fluorite GREEN 4 3.18 1.434 Gahnite GREEN 7.5 4.55 1.80 Gahnospinal GREEN 7.5 4.01 1.75 Jadeite GREEN 6.75 3.34 1.67 Kornerupine GREEN 6.5 3.3 1.67 Kyanite GREEN 5.00 3.62 1.72 Moldavite GREEN 5.5 2.4 1.48 Obsidian GREEN 5.25 2.4 1.49 Pseudophite GREEN 2.5 2.7 1.58 Sphalerite GREEN 3.75 4.05 2.37 Sphene GREEN 5.25 3.52 1.97 Spodumene GREEN 6.00 3.18 1.67 Willemite GREEN 5.5 4 1.71 Aventurine GREEN 5.75 2.6 1.55 Agalmatolite GREEN 2.5 2.8 1.58 Chalcedony GREEN 7 2.6 1.55 Diopside GREEN 5.00 3.35 1.69 Faustite GREEN 6.25 2.8 1.63 Idocrese GREEN 6.5 3.4 1.708 Labradorite GREEN 6 2.7 1.56 Malachite GREEN 4 4 1.78 Microcline GREEN 6.25 2.56 1.53 Nephrite GREEN 6.00 2.95 1.62 Prehnite GREEN 6.25 2.90 1.63 Pseudophite GREEN 2.5 2.7 1.58 Quartz GREEN 7 2.66 1.55 Saussurite GREEN 6.75 3.2 1.71 Serpentine GREEN 3.00 2.57 1.56 Sillimanite GREEN 6.00 3.2 1.67 Smithsonite GREEN 5 4.40 1.74 Steatite GREEN 1.25 2.75 1.56 Turquoise GREEN 5.75 2.8 1.63 Tourmaline GREEN 7.25 3.08 1.63 Variscite GREEN 4.00 2.35 1.58 Verdite GREEN 7 3.10 1.58 Zoisite GREEN 6.5 3.35 1.695 Amber YELLOW 2.25 1.08 1.54 Anatase YELLOW 5.75 3.9 2.52 Andalusite YELLOW 7.25 3.18 1.64 Apatite YELLOW 5 3.18 1.64 Axinite YELLOW 6.75 3.29 1.68 Beryl YELLOW 7.75 2.7 1.58 Blend YELLOW 3.2 4.09 2.37 Cassiterite YELLOW 6.00 6.95 2.04 Chrysoberyl YELLOW 8.5 3.61 1.75 Copal YELLOW 2 1.06 1.54 Corundum YELLOW 9 4 1.77 Diamond YELLOW 10 3.52 2.417 Fluorite YELLOW 4 3.18 1.434 Grossularite YELLOW 7 3.61 1.735 Idocrase YELLOW 6.5 3.4 1.72 Kornerupine YELLOW 6.5 3.3 1.67 Labradorite YELLOW 6 2.7 1.56 Obsidian YELLOW 5 2.45 1.5 Opal (fire) YELLOW 5.75 2 1.45 Peridot YELLOW 6.00 3.34 1.67 Quartz YELLOW 7 2.66 1.544/3 Synth Rutile YELLOW 6.25 4.26 2.76 Sinhalite YELLOW 6.00 3.45 1.69 Scheelite YELLOW 5 6.12 1.93 Spessartite YELLOW 7.25 4.15 1.81 Sphalerite YELLOW 3.75 4.05 2.37 Sphene YELLOW 5.25 3.52 1.97 Spinel YELLOW 8 3.6 1.718 Staurolite YELLOW 7.25 3.75 1.74 Topaz YELLOW 8 3.53 1.62 Tourmaline YELLOW 7.25 3.07 1.63 Willemite YELLOW 5.5 4 1.71 Zircon(high) YELLOW 7.25 4.7 1.95 Opal CLEAR 6 2.10 1.45 Lithium niobate CLEAR 5.5 4.64 2.25 Phenacite CLEAR 7.5 2.96 1.66 Moonstone CLEAR 6 2.57 1.52 Beryl CLEAR 7.5 2.70 1.58 Tourmaline CLEAR 7.25 3.06 1.63 Fluorite CLEAR 4 3.18 1.434 Diamond CLEAR 10 3.52 2.42 Topaz CLEAR 8 3.56 1.62 Spinel CLEAR 8 3.60 1.718 Spinel (synth) CLEAR 8 3.63 1.718 Rutile (synth) CLEAR 6.25 4.25 2.76