Agate (Chalcedony) Gemstones
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Hardness
6.5 - 7.0 on the Mohs scale.
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Occurrence
Worldwide. A member of the chalcedony family (micro-crystalline quartz).
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Appearance
Agate is a banded colored stone found in nodular masses associated with volcanic lavas. The curved banding is distinct from other forms of chalcedony. Agate, being porous, is often dyed or stained. Large agates are often cut in half and dyed to form attractive bookends. Agate occurs in a variety of forms, including petrified wood, which has had it's organic matter replaced by agate.
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Enhancements
Agate is often dyed with bright colors.
More information on gemstone enhancements.
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Gemstone Family
Agate is a member of the Chalcedony gemstone family.
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Agate Varieties
Agate Varieties
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15.21 ct. |
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| 23.1x16.2mm Cabochon, Oval Cut |
| Black |
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| Opaque |
| [N] Not enhanced. |
| One of a kind. |
| Part is clear and translucent. |
| Agate Chalcedony |
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39.41 ct. |
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| 26.0x25.4mm Cabochon, Heart Cut |
| Very Light |
| Grayish Yellow |
| Translucent |
| [N] Not enhanced. |
| One of a kind. |
| With areas of white and light grey. Pendant. |
| Agate Chalcedony |
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16.42 ct. |
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| 30.1x22.3mm Arrowhead Cut |
| Medium |
| Brownish Orangy Red |
| Opaque |
| [N] Not enhanced. |
| One of a kind. |
| With areas of black and white. |
| reddish Chalcedony |
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12.59 ct. |
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| 30.3x21.7mm Arrowhead Cut |
| Medium |
| Brownish Orangy Red |
| Opaque |
| [N] Not enhanced. |
| One of a kind. |
| Reddish Chalcedony |
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10.70 ct. |
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| 26.8x21.6mm Arrowhead Cut |
| Medium |
| Strong Orangy Red |
| Opaque |
| [N] Not enhanced. |
| One of a kind. |
| With areas of lighter brown. |
| Reddish Chalcedony |
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17.95 ct. |
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| 32.8x23.9mm Arrowhead Cut |
| Medium |
| Strong Green-Blue |
| Opaque |
| [N] Not enhanced. |
| One of a kind. |
| With areas of lighter brown and white. |
| Agate Chalcedony |
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36.95 ct. |
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| 26.2x15.3mm Briolette |
| Extremely Light |
| Brownish Yellowish Orange |
| Translucent |
| [N] Not enhanced. |
| One of a kind. |
| Blemish and scratch on the side. Non- returnable. |
| Agate Chalcedony |
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173.00 ct. |
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| 37.0x25.0mm Carved Skull |
| Black |
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| Opaque |
| [D] Dyed. |
| One of a kind. |
| Black with areas of white. |
| Agate Chalcedony |
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185.60 ct. |
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| 38.0x26.0mm Carved Skull |
| Colorless |
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| Opaque |
| [D] Dyed. |
| One of a kind. |
| White with areas of black. |
| Agate Chalcedony |
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621.15 ct. |
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| 144.0x26.0mm Obelisk |
| Dark |
| Brown |
| Opaque |
| [D] Dyed. |
| One of a kind. |
| With areas of translucent white. |
| Brown Chalcedony |
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