宝石の分散 — ファイアの参考表
115種の宝石の分散値（B–G間隔）を高い順に並べています。分散は「ファイア」の正体で、カットされた石が動くときに放つ虹色のきらめきです。実際に見えるファイアの量はカットが左右しますが、その上限はこの定数が決めます。
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Loupewise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。
Loupewiseを無料で試す →| 宝石 | 分散 (B–G) | RI範囲 | 光学的特性 | 硬度 |
|---|---|---|---|---|
| Cinnabar | 0.400 | 2.905–3.256 | 一軸性 (+) | 2–2.5 |
| Sphalerite | 0.156 | 2.369–2.371 | SR | 3.5–4 |
| Cuprite | 0.155 | 2.849 | SR | 3.5–4 |
| Moissanite | 0.104 | 2.648–2.691 | 一軸性 (+) | 9.25 |
| Cassiterite | 0.071 | 1.997–2.093 | 一軸性 (+) | 6–7 |
| Cubic Zirconia | 0.066 | 2.150–2.180 | SR | 8–8.5 |
| Demantoid Garnet | 0.057 | 1.880–1.895 | SR | 6.5–7 |
| Sphene | 0.051 | 1.843–2.110 | 二軸性 (+) | 5–5.5 |
| Benitoite | 0.046 | 1.757–1.804 | 一軸性 (+) | 6–6.5 |
| Blue Diamond | 0.044 | 2.417 | SR | 10 |
| Brown Diamond | 0.044 | 2.417 | SR | 10 |
| Diamond | 0.044 | 2.417 | SR | 10 |
| Pink Diamond | 0.044 | 2.417 | SR | 10 |
| Yellow Diamond | 0.044 | 2.417 | SR | 10 |
| Zircon | 0.039 | 1.925–1.984 | 一軸性 (+) | 7.5 |
| Low-Type Zircon | 0.038 | 1.780–1.815 | SR | 6 |
| Tanzanite | 0.030 | 1.691–1.700 | 二軸性 (+) | 6–7 |
| Grossular Garnet | 0.028 | 1.734–1.759 | SR | 6.5–7.5 |
| Hessonite Garnet | 0.028 | 1.730–1.760 | SR | 7–7.5 |
| Tsavorite Garnet | 0.028 | 1.730–1.760 | SR | 7–7.5 |
| YAG | 0.028 | 1.833 | SR | 8–8.5 |
| Spessartite Garnet | 0.027 | 1.790–1.815 | SR | 7–7.5 |
| Color-Change Garnet | 0.026 | 1.740–1.765 | SR | 7–7.5 |
| Rhodolite Garnet | 0.026 | 1.740–1.770 | SR | 7–7.5 |
| Malachite | 0.025 | 1.655–1.909 | 二軸性 (−) | 3.5–4 |
| Almandine Garnet | 0.024 | 1.770–1.830 | SR | 7–7.5 |
| Star Garnet | 0.024 | 1.770–1.830 | SR | 7–7.5 |
| Malaya / Umbalite Garnet | 0.023 | 1.730–1.780 | SR | 7–7.5 |
| Clinohumite | 0.022 | 1.625–1.675 | 二軸性 (+) | 6 |
| Pyrope Garnet | 0.022 | 1.730–1.760 | SR | 7–7.5 |
| Black Spinel | 0.020 | 1.712–1.730 | SR | 8 |
| Chrome Diopside | 0.020 | 1.664–1.730 | 二軸性 (+) | 5.5–6.5 |
| Diaspore | 0.020 | 1.702–1.752 | 二軸性 (+) | 6.5–7 |
| Kyanite | 0.020 | 1.712–1.734 | 二軸性 (−) | 4.5–7 |
| Opal | 0.020 | 1.370–1.470 | SR | 5.5–6.5 |
| Peridot | 0.020 | 1.654–1.690 | 二軸性 (+) | 6.5–7 |
| Prehnite | 0.020 | 1.611–1.665 | 二軸性 (+) | 6–6.5 |
| Spinel | 0.020 | 1.712–1.736 | SR | 7.5–8 |
| Synthetic Spinel | 0.020 | 1.725–1.728 | SR | 8 |
| Hauyne | 0.019 | 1.494–1.509 | SR | 5.5–6 |
| Taaffeite | 0.019 | 1.719–1.723 | 一軸性 (−) | 8–8.5 |
| Color-Change Sapphire | 0.018 | 1.762–1.770 | 一軸性 (−) | 9 |
| Hackmanite | 0.018 | 1.483–1.487 | SR | 5.5–6 |
| Kornerupine | 0.018 | 1.660–1.699 | 二軸性 (−) | 6.5 |
| Padparadscha Sapphire | 0.018 | 1.762–1.770 | 一軸性 (−) | 9 |
| Pink Sapphire | 0.018 | 1.762–1.770 | 一軸性 (−) | 9 |
| Ruby | 0.018 | 1.762–1.770 | 一軸性 (−) | 9 |
| Sapphire | 0.018 | 1.762–1.770 | 一軸性 (−) | 9 |
| Sinhalite | 0.018 | 1.665–1.712 | 二軸性 (−) | 6.5–7 |
| Star Ruby | 0.018 | 1.762–1.770 | 一軸性 (−) | 9 |
| Star Sapphire | 0.018 | 1.762–1.770 | 一軸性 (−) | 9 |
| Synthetic Color-Change Corundum | 0.018 | 1.762–1.770 | 一軸性 (−) | 9 |
| White Sapphire | 0.018 | 1.762–1.770 | 一軸性 (−) | 9 |
| Yellow Sapphire | 0.018 | 1.762–1.770 | 一軸性 (−) | 9 |
| Calcite | 0.017 | 1.486–1.658 | 一軸性 (−) | 3 |
| Chrome Tourmaline | 0.017 | 1.624–1.660 | 一軸性 (−) | 7–7.5 |
| Danburite | 0.017 | 1.627–1.636 | 二軸性 (−) | 7–7.5 |
| Enstatite | 0.017 | 1.663–1.673 | 二軸性 (+) | 5–5.5 |
| Green Tourmaline | 0.017 | 1.616–1.650 | 一軸性 (−) | 7–7.5 |
| Hiddenite | 0.017 | 1.660–1.676 | 二軸性 (+) | 6.5–7 |
| Indicolite | 0.017 | 1.624–1.644 | 一軸性 (−) | 7–7.5 |
| Iolite | 0.017 | 1.540–1.560 | 二軸性 (−) | 7–7.5 |
| Kunzite | 0.017 | 1.660–1.676 | 二軸性 (+) | 6.5–7 |
| Paraiba Tourmaline | 0.017 | 1.624–1.644 | 一軸性 (−) | 7–7.5 |
| Rubellite | 0.017 | 1.624–1.644 | 一軸性 (−) | 7–7.5 |
| Scapolite | 0.017 | 1.540–1.572 | 一軸性 (−) | 6–6.5 |
| Tourmaline | 0.017 | 1.624–1.644 | 一軸性 (−) | 7–7.5 |
| Watermelon Tourmaline | 0.017 | 1.616–1.650 | 一軸性 (−) | 7–7.5 |
| Andalusite | 0.016 | 1.629–1.649 | 二軸性 (−) | 7–7.5 |
| Rhodonite | 0.016 | 1.716–1.752 | 二軸性 (+) | 5.5–6.5 |
| Variscite | 0.016 | 1.560–1.594 | 二軸性 (−) | 3.5–4.5 |
| Alexandrite | 0.015 | 1.746–1.755 | 二軸性 (+) | 8.5 |
| Cat's Eye Chrysoberyl | 0.015 | 1.746–1.755 | 二軸性 (+) | 8.5 |
| Chrysoberyl | 0.015 | 1.746–1.755 | 二軸性 (+) | 8.5 |
| Grandidierite | 0.015 | 1.590–1.623 | 二軸性 (−) | 7–7.5 |
| Phenakite | 0.015 | 1.654–1.670 | 一軸性 (+) | 7.5–8 |
| Rhodochrosite | 0.015 | 1.600–1.820 | 一軸性 (−) | 3.5–4 |
| Aquamarine | 0.014 | 1.577–1.583 | 一軸性 (−) | 7.5–8 |
| Emerald | 0.014 | 1.565–1.602 | 一軸性 (−) | 7.5–8 |
| Goshenite | 0.014 | 1.577–1.583 | 一軸性 (−) | 7.5–8 |
| Heliodor | 0.014 | 1.568–1.580 | 一軸性 (−) | 7.5–8 |
| Morganite | 0.014 | 1.572–1.600 | 一軸性 (−) | 7.5–8 |
| Red Beryl | 0.014 | 1.564–1.574 | 一軸性 (−) | 7.5–8 |
| Topaz | 0.014 | 1.609–1.643 | 二軸性 (+) | 8 |
| Agate | 0.013 | 1.530–1.543 | 集合体 | 6.5–7 |
| Amethyst | 0.013 | 1.544–1.553 | 一軸性 (+) | 7 |
| Ametrine | 0.013 | 1.544–1.553 | 一軸性 (+) | 7 |
| Apatite | 0.013 | 1.628–1.649 | 一軸性 (−) | 5 |
| Aventurine | 0.013 | 1.544–1.553 | 集合体 | 7 |
| Bloodstone | 0.013 | 1.530–1.543 | 集合体 | 6.5–7 |
| Carnelian | 0.013 | 1.530–1.543 | 集合体 | 6.5–7 |
| Chalcedony | 0.013 | 1.530–1.543 | 集合体 | 6.5–7 |
| Chrysoprase | 0.013 | 1.530–1.543 | 集合体 | 6.5–7 |
| Citrine | 0.013 | 1.544–1.553 | 一軸性 (+) | 7 |
| Hawk's Eye | 0.013 | 1.544–1.553 | 集合体 | 7 |
| Onyx | 0.013 | 1.530–1.543 | 集合体 | 6.5–7 |
| Prasiolite | 0.013 | 1.544–1.553 | 一軸性 (+) | 7 |
| Rock Crystal | 0.013 | 1.544–1.553 | 一軸性 (+) | 7 |
| Rose Quartz | 0.013 | 1.544–1.553 | 一軸性 (+) | 7 |
| Smoky Quartz | 0.013 | 1.544–1.553 | 一軸性 (+) | 7 |
| Star Diopside | 0.013 | 1.664–1.721 | 二軸性 (+) | 5–6 |
| Tiger's Eye | 0.013 | 1.544–1.553 | 集合体 | 7 |
| Chrysocolla Chalcedony | 0.013 | 1.530–1.543 | 集合体 | 6.5–7 |
| Amazonite | 0.012 | 1.514–1.530 | 二軸性 (−) | 6–6.5 |
| Labradorite | 0.012 | 1.559–1.573 | 二軸性 (+) | 6–6.5 |
| Moonstone | 0.012 | 1.518–1.526 | 二軸性 (−) | 6–6.5 |
| Rainbow Moonstone | 0.012 | 1.559–1.572 | 二軸性 (−) | 6–6.5 |
| Sunstone | 0.012 | 1.537–1.572 | 二軸性 (−) | 6–6.5 |
| Thulite | 0.012 | 1.691–1.704 | 二軸性 (+) | 6–7 |
| Larimar | 0.010 | 1.595–1.640 | 二軸性 (+) | 4.5–5 |
| Moldavite | 0.010 | 1.480–1.510 | SR | 5.5 |
| Obsidian | 0.010 | 1.480–1.510 | SR | 5–5.5 |
| Sugilite | 0.010 | 1.607–1.610 | 一軸性 (−) | 5.5–6.5 |
| Fluorite | 0.007 | 1.432–1.436 | SR | 4 |
| Charoite | 0.005 | 1.550–1.559 | 集合体 | 5–6 |
分散がもっとも大きい宝石は？
本表の132種のうち、分散がもっとも大きいのはCinnabar（0.400）で、次いでSphalerite (0.156), Cuprite (0.155), Moissanite (0.104)です。ダイヤモンドは0.044です。
モアッサナイトはダイヤモンドよりファイアが強い？
はい。モアッサナイトの分散は0.104、ダイヤモンドは0.044で、2倍以上あります。ダイヤモンドとされる石のファイアが強すぎる場合はまずこれを疑い、ファセットの二重像（複屈折0.043）で確認します。
関連ページ: Reference Database (EN) · Guide (EN)