宝石の屈折率 — リファレンス表
130種の宝石の屈折率を最大RIの高い順に掲載。複屈折と光学的特性も併記。屈折率は屈折計で測定され、鉱物の構造で決まる、宝石学で最も信頼性の高い定数の一つです。
宝石名は国際的な取引名(英語)で表記し、各種の詳細ページ(英語)にリンクしています。
測定値をGemIDに入力すると、エンジンが候補を自動で絞り込みます。アプリは日本語に対応しています。
GemIDを無料で試す →| 宝石 | RI最小 | RI最大 | 複屈折 | 光学的特性 |
|---|---|---|---|---|
| Cinnabar | 2.905 | 3.256 | 0.351 | DR_U+ |
| Hematite | 2.940 | 3.220 | 0.280 | DR_U- |
| Cuprite | 2.849 | 2.849 | — | SR |
| Moissanite | 2.648 | 2.691 | 0.043 | DR_U+ |
| Sphalerite | 2.369 | 2.500 | — | SR |
| Blue Diamond | 2.417 | 2.417 | — | SR |
| Brown Diamond | 2.417 | 2.417 | — | SR |
| Diamond | 2.417 | 2.417 | — | SR |
| Pink Diamond | 2.417 | 2.417 | — | SR |
| Yellow Diamond | 2.417 | 2.417 | — | SR |
| Cubic Zirconia | 2.150 | 2.180 | — | SR |
| Sphene | 1.843 | 2.110 | 0.100 | DR_B+ |
| Cassiterite | 2.010 | 2.100 | 0.096 | DR_U+ |
| Zircon | 1.925 | 1.984 | 0.059 | DR_U+ |
| Malachite | 1.655 | 1.909 | 0.254 | DR_B- |
| Demantoid Garnet | 1.880 | 1.895 | — | SR |
| YAG | 1.833 | 1.833 | — | SR |
| Almandine Garnet | 1.770 | 1.830 | — | SR |
| Star Garnet | 1.770 | 1.830 | — | SR |
| Rhodochrosite | 1.600 | 1.820 | 0.220 | DR_U- |
| Low-Type Zircon | 1.780 | 1.815 | — | SR |
| Spessartite Garnet | 1.790 | 1.815 | — | SR |
| Benitoite | 1.757 | 1.804 | 0.047 | DR_U+ |
| Malaya / Umbalite Garnet | 1.730 | 1.780 | — | SR |
| Color-Change Sapphire | 1.762 | 1.770 | 0.008 | DR_U- |
| Padparadscha Sapphire | 1.762 | 1.770 | 0.008 | DR_U- |
| Pink Sapphire | 1.762 | 1.770 | 0.008 | DR_U- |
| Rhodolite Garnet | 1.740 | 1.770 | — | SR |
| Ruby | 1.762 | 1.770 | 0.008 | DR_U- |
| Sapphire | 1.762 | 1.770 | 0.008 | DR_U- |
| Star Ruby | 1.762 | 1.770 | 0.008 | DR_U- |
| Star Sapphire | 1.762 | 1.770 | 0.008 | DR_U- |
| Synthetic Color-Change Corundum | 1.762 | 1.770 | 0.008 | DR_U- |
| White Sapphire | 1.762 | 1.770 | 0.008 | DR_U- |
| Yellow Sapphire | 1.762 | 1.770 | 0.008 | DR_U- |
| Color-Change Garnet | 1.740 | 1.765 | — | SR |
| Hessonite Garnet | 1.730 | 1.760 | — | SR |
| Pyrope Garnet | 1.730 | 1.760 | — | SR |
| Tsavorite Garnet | 1.730 | 1.760 | — | SR |
| Grossular Garnet | 1.734 | 1.759 | — | SR |
| Alexandrite | 1.746 | 1.755 | 0.009 | DR_B+ |
| Cat's Eye Chrysoberyl | 1.746 | 1.755 | 0.009 | DR_B+ |
| Chrysoberyl | 1.746 | 1.755 | 0.009 | DR_B+ |
| Diaspore | 1.685 | 1.752 | 0.048 | DR_B+ |
| Rhodonite | 1.716 | 1.752 | 0.014 | DR_B+ |
| Spinel | 1.712 | 1.736 | — | SR |
| Kyanite | 1.712 | 1.734 | 0.016 | DR_B- |
| Black Spinel | 1.712 | 1.730 | — | SR |
| Chrome Diopside | 1.664 | 1.730 | 0.030 | DR_B+ |
| Synthetic Spinel | 1.725 | 1.728 | — | SR |
| Taaffeite | 1.719 | 1.723 | 0.004 | DR_U- |
| Star Diopside | 1.664 | 1.721 | 0.030 | DR_B+ |
| Sinhalite | 1.665 | 1.712 | 0.038 | DR_B- |
| Thulite | 1.691 | 1.704 | 0.009 | DR_B+ |
| Tanzanite | 1.691 | 1.700 | 0.009 | DR_B+ |
| Kornerupine | 1.660 | 1.699 | 0.013 | DR_B- |
| Pearl | 1.520 | 1.690 | — | AGG |
| Peridot | 1.654 | 1.690 | 0.036 | DR_B+ |
| Jadeite | 1.654 | 1.688 | — | AGG |
| Jet | 1.640 | 1.680 | — | SR |
| Hiddenite | 1.660 | 1.676 | 0.016 | DR_B+ |
| Kunzite | 1.660 | 1.676 | 0.016 | DR_B+ |
| Clinohumite | 1.625 | 1.675 | 0.028 | DR_B+ |
| Enstatite | 1.663 | 1.673 | 0.010 | DR_B+ |
| Lapis Lazuli | 1.500 | 1.670 | — | AGG |
| Phenakite | 1.654 | 1.670 | 0.016 | DR_U+ |
| Prehnite | 1.611 | 1.665 | 0.030 | DR_B+ |
| Chrome Tourmaline | 1.624 | 1.660 | 0.018 | DR_U- |
| Coral | 1.486 | 1.658 | — | AGG |
| Green Tourmaline | 1.616 | 1.650 | 0.018 | DR_U- |
| Turquoise | 1.610 | 1.650 | — | AGG |
| Watermelon Tourmaline | 1.616 | 1.650 | 0.018 | DR_U- |
| Andalusite | 1.629 | 1.649 | 0.010 | DR_B- |
| Apatite | 1.628 | 1.649 | 0.006 | DR_U- |
| Indicolite | 1.624 | 1.644 | 0.018 | DR_U- |
| Paraiba Tourmaline | 1.624 | 1.644 | 0.018 | DR_U- |
| Rubellite | 1.624 | 1.644 | 0.018 | DR_U- |
| Tourmaline | 1.624 | 1.644 | 0.020 | DR_U- |
| Topaz | 1.609 | 1.643 | 0.008 | DR_B+ |
| Larimar | 1.595 | 1.640 | 0.040 | DR_B+ |
| Danburite | 1.627 | 1.636 | 0.006 | DR_B- |
| Chrysocolla | 1.460 | 1.630 | — | AGG |
| Nephrite | 1.600 | 1.627 | — | AGG |
| Grandidierite | 1.590 | 1.623 | 0.033 | DR_B- |
| Sugilite | 1.607 | 1.610 | 0.002 | DR_U- |
| Howlite | 1.583 | 1.608 | — | AGG |
| Emerald | 1.565 | 1.602 | 0.006 | DR_U- |
| Morganite | 1.572 | 1.600 | 0.008 | DR_U- |
| Variscite | 1.560 | 1.590 | 0.031 | DR_B- |
| Aquamarine | 1.577 | 1.583 | 0.006 | DR_U- |
| Goshenite | 1.577 | 1.583 | 0.006 | DR_U- |
| Heliodor | 1.568 | 1.580 | 0.006 | DR_U- |
| Red Beryl | 1.564 | 1.574 | 0.007 | DR_U- |
| Labradorite | 1.559 | 1.573 | 0.011 | DR_B- |
| Rainbow Moonstone | 1.559 | 1.572 | 0.011 | DR_B- |
| Scapolite | 1.540 | 1.572 | 0.020 | DR_U- |
| Sunstone | 1.537 | 1.572 | 0.010 | DR_B- |
| Serpentine | 1.560 | 1.571 | — | AGG |
| Iolite | 1.540 | 1.560 | 0.012 | DR_B- |
| Charoite | 1.550 | 1.559 | 0.009 | AGG |
| Amethyst | 1.544 | 1.553 | 0.009 | DR_U+ |
| Ametrine | 1.544 | 1.553 | 0.009 | DR_U+ |
| Aventurine | 1.544 | 1.553 | — | AGG |
| Citrine | 1.544 | 1.553 | 0.009 | DR_U+ |
| Hawk's Eye | 1.544 | 1.553 | — | AGG |
| Prasiolite | 1.544 | 1.553 | 0.009 | DR_U+ |
| Rock Crystal | 1.544 | 1.553 | 0.009 | DR_U+ |
| Rose Quartz | 1.544 | 1.553 | 0.009 | DR_U+ |
| Smoky Quartz | 1.544 | 1.553 | 0.009 | DR_U+ |
| Tiger's Eye | 1.544 | 1.553 | — | AGG |
| Amber | 1.539 | 1.545 | — | SR |
| Agate | 1.530 | 1.543 | — | AGG |
| Bloodstone | 1.530 | 1.543 | — | AGG |
| Carnelian | 1.530 | 1.543 | — | AGG |
| Chalcedony | 1.530 | 1.543 | — | AGG |
| Chrysoprase | 1.530 | 1.543 | — | AGG |
| Onyx | 1.530 | 1.543 | — | AGG |
| Ivory | 1.535 | 1.540 | — | AGG |
| Pietersite | 1.534 | 1.540 | — | AGG |
| Amazonite | 1.514 | 1.530 | 0.008 | DR_B- |
| Moonstone | 1.518 | 1.526 | 0.008 | DR_B- |
| Moldavite | 1.480 | 1.510 | — | SR |
| Obsidian | 1.480 | 1.510 | — | SR |
| Hauyne | 1.494 | 1.509 | — | SR |
| Hackmanite | 1.483 | 1.487 | — | SR |
| Sodalite | 1.483 | 1.487 | — | AGG |
| Fire Opal | 1.370 | 1.470 | — | SR |
| Opal | 1.370 | 1.470 | — | SR |
| Black Opal | 1.440 | 1.460 | — | SR |
| Fluorite | 1.432 | 1.436 | — | SR |
最も屈折率が高い宝石は？
この一覧の130種の中では、CinnabarのRIが最も高く(2.905–3.256)、ダイヤモンドは2.417です。標準的な屈折計は約1.81以上を「測定範囲外(OTL)」として読み取れません。
ダイヤモンドの屈折率は？
ダイヤモンドの屈折率は2.417です。単屈折で複屈折はゼロ — 複屈折を示すモアサナイトとの識別点の一つです。
ルビーの屈折率は？
ルビーのRIは1.762–1.770、複屈折は0.008です。サファイアは同じ鉱物(コランダム)で同じ範囲を示します。
関連ページ: Reference Database (EN) · Guide (EN)