Gems by Size
Gemstone types grouped by typical size
VERY LARGE STONES (50+ carats)
| Gem Type | Typical Size |
|---|---|
| Anyolite | 5-100+ carats (commercial: 10-50 carats; typically carved or cabochon, large pieces common) |
| Rainbow Fluorite | 5-100+ carats (commercial: 10-50 carats; typically larger decorative pieces) |
| Amethyst | 1-100+ carats (commercial: 3-30 carats; very large clean stones commonly available) |
| Citrine | 1-100+ carats (commercial: 3-50 carats; large sizes readily available) |
| Smoky Quartz | 1-100+ carats (commercial: 5-50 carats; large clean stones readily available) |
| Blue Topaz | 1-100+ carats (commercial: 3-50 carats; very large sizes readily available due to treatment) |
| Kunzite | 1-100+ carats (commercial: 5-50 carats; very large clean crystals available) |
| Diamond | 0.01-100+ carats (commercial: 0.25-5 carats; exceptional stones can exceed 100 carats) |
LARGE STONES (20-50 carats)
| Gem Type | Typical Size |
|---|---|
| Sodalite | 5-50 carats (commercial: 10-30 carats; typically cabochons, large pieces available) |
| Aquamarine | 1-50+ carats (commercial: 2-20 carats; large clean stones common, can exceed 100 carats) |
| Morganite | 1-50+ carats (commercial: 2-20 carats; large clean stones are readily available) |
| Rose Quartz | 1-50+ carats (commercial: 5-30 carats; typically cabochons, large sizes common) |
| Ametrine | 1-50 carats (commercial: 3-25 carats; large clean stones available from Bolivia) |
| Black Tourmaline | 1-50 carats (commercial: 2-20 carats; large sizes available, rarely faceted) |
| Yellow Topaz | 1-50 carats (commercial: 2-25 carats; large sizes available) |
| White Topaz | 1-50 carats (commercial: 2-30 carats; large clean stones very common) |
| Purple Fluorite | 1-50+ carats (commercial: 5-30 carats; large clean stones common but soft) |
| Green Fluorite | 1-50+ carats (commercial: 5-30 carats; large specimens readily available) |
| Fluorite | 1-50+ carats (commercial: 5-30 carats; very large stones available, softness limits use) |
| Calcite | 1-50+ carats (commercial: 5-30 carats; large stones available but very soft) |
| Sapphire | 0.5-50+ carats (commercial: 1-10 carats; large fine stones available but expensive) |
| Tanzanite | 0.5-50+ carats (commercial: 1-15 carats; large clean stones available but expensive) |
MEDIUM TO LARGE STONES (10-30 carats)
| Gem Type | Typical Size |
|---|---|
| Heliodor | 1-30 carats (commercial: 2-15 carats; medium to large sizes available) |
| Yellow Sapphire | 1-30 carats (commercial: 2-15 carats; large stones more available than ruby) |
| Prasiolite | 1-30 carats (commercial: 3-15 carats; medium to large sizes available) |
| Moonstone | 1-30 carats (commercial: 3-15 carats; cabochons typically, larger sizes available) |
| Peridot | 1-30 carats (commercial: 2-15 carats; larger stones available but eye-clean material is limiting) |
| Blue Fluorite | 1-30 carats (commercial: 3-20 carats; less common than other colors in large sizes) |
| Rubellite | 0.5-30 carats (commercial: 1-15 carats; clean stones in larger sizes available) |
| Verdelite | 0.5-30 carats (commercial: 1-20 carats; larger sizes more available than blue) |
| Blue Zircon | 0.5-30 carats (commercial: 2-15 carats; large sizes available) |
| Yellow Zircon | 0.5-30 carats (commercial: 1-15 carats; medium to large sizes available) |
| Imperial Topaz | 0.5-30 carats (commercial: 1-10 carats; fine color over 10 carats is rare) |
| Almandine | 1-20 carats (commercial: 2-10 carats; large stones common and affordable) |
| Hessonite | 1-20 carats (commercial: 2-12 carats; large sizes available) |
| Sunstone | 1-20 carats (commercial: 2-10 carats; Oregon sunstone can be larger) |
| Orthoclase | 1-20 carats (commercial: 2-10 carats; faceted material less common) |
| Iolite | 1-20 carats (commercial: 2-10 carats; medium sizes common, very large stones less available) |
| Andalusite | 1-20 carats (commercial: 2-10 carats; medium sizes most common) |
| Goshenite | 0.5-20 carats (commercial: 1-10 carats; larger sizes available but less in demand) |
| Pink Sapphire | 0.5-20 carats (commercial: 1-8 carats; larger untreated stones are less common) |
| Red Spinel | 0.5-20 carats (commercial: 1-8 carats; fine stones over 10 carats are rare) |
| Pink Spinel | 0.5-20 carats (commercial: 1-10 carats; larger sizes more available than red) |
| Indicolite | 0.5-20 carats (commercial: 1-10 carats; larger clean stones uncommon) |
| Watermelon Tourmaline | 0.5-20 carats (commercial: 1-10 carats; typically cut as slices) |
| White Zircon | 0.5-20 carats (commercial: 1-10 carats; typically cut small as diamond alternative) |
| Hyacinth | 0.5-20 carats (commercial: 1-10 carats; medium sizes most common) |
| Pink Topaz | 0.5-20 carats (commercial: 1-8 carats; natural pink in larger sizes is rare) |
| Yellow Chrysoberyl | 0.5-20 carats (commercial: 1-10 carats; cat's eye typically smaller) |
| Green Apatite | 0.5-20 carats (commercial: 1-10 carats; medium sizes available) |
| Hiddenite | 0.5-20 carats (commercial: 1-8 carats; larger stones less common than kunzite) |
| Sphene (Titanite) | 0.5-20 carats (commercial: 1-8 carats; larger clean stones are uncommon) |
| Sphalerite | 0.5-20 carats (commercial: 1-8 carats; fragility limits cutting of large stones) |
| Emerald | 0.25-20 carats (commercial: 0.5-5 carats; clean stones over 10 carats are rare) |
| Ruby | 0.25-20 carats (commercial: 0.5-5 carats; fine quality stones over 10 carats are extremely rare) |
SMALL TO MEDIUM STONES (under 10 carats)
| Gem Type | Typical Size |
|---|---|
| Grossular | 1-15 carats (commercial: 2-8 carats; size varies by color variety) |
| Spessartine | 0.5-15 carats (commercial: 1-8 carats; Mandarin garnets typically smaller) |
| Blue Spinel | 0.5-15 carats (commercial: 1-5 carats; cobalt blue typically smaller, over 5 carats rare) |
| Blue Apatite | 0.5-15 carats (commercial: 1-8 carats; larger eye-clean stones uncommon) |
| Padparadscha Sapphire | 0.5-10 carats (commercial: 1-5 carats; fine stones over 5 carats are rare) |
| Pyrope | 0.5-10 carats (commercial: 1-5 carats; typically found in smaller sizes) |
| Andradite | 0.5-10 carats (commercial: 1-5 carats; most varieties in smaller sizes) |
| Yellow Apatite | 0.5-10 carats (commercial: 1-5 carats; typically smaller sizes) |
| Rhodochrosite | 0.5-10 carats (commercial: 1-5 carats; faceted stones typically small, cabochons larger) |
| Bastnasite | 0.5-10 carats (commercial: 1-5 carats; faceted stones rare and typically small) |
| Blue Kyanite | 0.5-10 carats (commercial: 1-5 carats; typically smaller faceted stones) |
| Sillimanite | 0.5-10 carats (commercial: 1-5 carats; cat's eye varieties typically smaller) |
| Epidote | 0.5-10 carats (commercial: 1-5 carats; typically small faceted stones) |
| Axinite | 0.5-10 carats (commercial: 1-5 carats; collector stones typically under 5 carats) |
| Chondrodite | 0.5-10 carats (commercial: 1-5 carats; facetable material is uncommon and usually small) |
| Tsavorite | 0.25-10 carats (commercial: 0.5-3 carats; clean stones over 5 carats are rare) |
| Alexandrite | 0.25-10 carats (commercial: 0.5-3 carats; stones over 5 carats with strong change are very rare) |
| Paraiba Tourmaline | 0.1-10 carats (commercial: 0.25-3 carats; stones over 5 carats are exceptionally rare) |
VERY SMALL STONES (typically under 3 carats)
| Gem Type | Typical Size |
|---|---|
| Orange Kyanite | 0.5-5 carats (commercial: 1-3 carats; rare and typically small) |
| Staurolite | 0.5-5 carats (commercial: 1-3 carats; faceted stones rare and small) |
| Demantoid | 0.25-5 carats (commercial: 0.5-2 carats; stones over 3 carats are very rare) |
| Taaffeite | 0.1-5 carats (commercial: 0.25-2 carats; most stones under 2 carats) |
| Benitoite | 0.1-5 carats (commercial: 0.25-2 carats; stones over 2 carats are very rare) |
| Jeremejevite | 0.1-5 carats (commercial: 0.25-2 carats; museum-quality stones typically under 3 carats) |
| Grandidierite | 0.1-5 carats (commercial: 0.25-2 carats; faceted stones over 3 carats are rare) |
| Musgravite | 0.1-3 carats (commercial: 0.25-1 carat; extremely rare in any size) |
| Painite | 0.1-3 carats (commercial: 0.25-1 carat; extremely rare in any size) |
| Serendibite | 0.1-3 carats (commercial: 0.25-1 carat; exceptionally rare, most under 2 carats) |
| Bixbite | 0.1-2 carats (commercial: 0.25-1 carat; stones over 2 carats are exceptionally rare) |