How Much Is Agate Worth?
Agate is a banded, translucent variety of chalcedony (microcrystalline quartz), prized for its curved concentric bands, 'fortification' patterns, and (in geodes) crystal-lined centers. It's abundant and affordable: tumbled stones and small slices sell for $1–$15, polished slabs, bookends, and geode halves for $10–$80, and large fine specimens or rare types (Laguna, Botswana, fire, moss agate) for $30–$300+. Value comes from crisp, high-contrast natural banding, interesting patterns, translucency, and size. A large share of the colorful dyed agate slices sold as coasters and ornaments are artificially dyed bright pink, blue, or purple — natural agate colors are more muted, so vivid candy colors are a reliable sign of dye.
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Agate value by type
| Type | Typical price |
|---|---|
| Tumbled / small slices | $1 – $15 |
| Polished slabs / geode halves | $10 – $80 |
| Bookends / large geodes | $30 – $200 |
| Fine Laguna / fire agate | $40 – $300+ |
Educational ballparks for typical specimens — not a formal appraisal.
What drives agate value
- Banding & pattern. Crisp, high-contrast natural bands and fine 'fortification' patterns are most prized.
- Type & rarity. Laguna, Botswana, fire, and fine moss agate command premiums over common material.
- Natural vs dyed. Naturally colored agate beats artificially dyed candy-colored slices.
- Size & translucency. Large translucent pieces with a clean polish add value.
Is your agate real?
Agate is common and cheap, so imitation is rare — the real issue is dyeing. Natural agate colors are typically muted grays, browns, whites, and soft blues; the bright magenta, teal, and neon-purple slices are dyed. Agate is Mohs 7 quartz and scratches glass.
Full agatereal-or-fake guide & at-home tests →FAQ
- Are dyed agates 'real'?
- Yes — the stone is genuine agate, but the vivid color is artificial. Naturally colored agate is generally preferred by collectors.
- How is agate different from jasper?
- Agate is translucent and banded; jasper (also chalcedony) is opaque and usually solid-colored or scenic.