Prices checked September 25, 2026

How Much Is a Geode Worth?

Geode value: about $2–$60 for most geodes; amethyst cathedrals about $10–$56 per pound

Most geodes people find or buy are worth a few dollars to about $60. Small break-your-own geodes from Morocco and Mexico retail for about $3–$25, and nice opened pairs for $20–$80. Big amethyst 'cathedrals' from Brazil and Uruguay are priced by weight, about $10–$56 a pound, so large ones run from hundreds to over $13,000. Two things move the price most: how hollow a geode is and what grew inside. Keep in mind that these are dealer asking prices: at regional auctions, ordinary geodes often sell for only a few dollars.

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Geode Prices by Type (2026)

Retail asking prices from rock dealers, September 2026, unless marked otherwise.

Type	Details	Typical price
Moroccan break-your-own	Whole, 1–6 inches; sold by size	Typical price: $3–$80 each
Las Choyas 'coconut' geodes (Mexico)	Whole, 2–7 inches; stock guaranteed 95% hollow costs 2–3 times more per pound	Typical price: $12–$395 each
Keokuk geodes (Iowa, Illinois, Missouri)	Small cracked halves $4–$7; specimen pairs with calcite $22–$65; dig-your-own sites charge about $25 for a bucket or 50 lb	Typical price: $4–$250
Kentucky geodes	Unopened, from a collector-seller	Typical price: $8–$10 per pound
Dugway geodes (Utah)	Uncut about $7/lb; cut and polished halves and bookends cost far more	Typical price: $7 per pound to $900
Brazilian amethyst cathedrals	Priced by weight; median about $32/lb across 222 listings, lower per pound for bigger pieces	Typical price: $10–$56 per pound
Uruguayan amethyst geodes	Darker purple; small geodes about $41–$72/lb, giant ones up to about $29,000	Typical price: $29–$29,000
Citrine cathedrals	Almost always heat-treated amethyst; priced at or below amethyst	Typical price: $13–$36 per pound
Resale at regional auctions	Winning bids, 2024–2026: cracked Keokuk lots and 3–10 lb amethyst cathedrals	Typical price: $2–$24 a lot; $40–$97 a cathedral

Asking prices are far above what a private seller usually gets: regional auction results in 2024–2026 were often only 10–40% of comparable dealer prices, and shipping costs push bids on heavy geodes even lower.

What Makes a Geode Worth More

The factors buyers and dealers actually price on.

How hollow it is

The biggest driver for unopened geodes. The same size Mexican geode costs 2–3 times more per pound when guaranteed 95% hollow than when sold semi-hollow.

Crystal type and color

Amethyst beats clear quartz, and dark amethyst sells for about 3–5 times the price of pale material. Darker Uruguayan amethyst costs more per pound than Brazilian.

Crystal size, sparkle and symmetry

Larger, even, sparkling crystals in a well-shaped cavity look better and sell for more. There is no formal grading system.

Secondary minerals

Calcite, pyrite, goethite or rare 'red quartz' inside a Keokuk geode can raise its price; dealers feature them in their best listings.

Matched pairs

Both halves together are worth much more than one: one shop prices a 3.3-inch half at $29 and a matched pair at $78.

Cutting and polishing

Uncut Dugway geodes sell for about $7 a pound, while cut and polished halves bring $42 to several hundred dollars.

Size and weight

Big pieces cost more in total but less per pound: Brazilian cathedrals drop from a median of about $46/lb under 15 lb to about $24/lb over 250 lb. Heavy geodes also cost a lot to ship, which cuts resale bids.

Natural or treated

Dyed geodes carry no premium, and heat-treated 'citrine' sells at or below amethyst. Sellers must disclose dyeing and heating.

Is It a Geode? Tests Before You Crack It

Only opening or cutting a rock proves it's a geode; many geodes are completely filled with minerals. These signs raise the odds.

1
Shape and rind
Geodes are roughly round with a lumpy, 'cauliflower' outer rind. Dugway geodes are dark gray, hard and 2–4 inches across.
2
Light for its size
A geode with a big cavity feels lighter than a solid rock of the same size. Dealers pick lighter geodes to raise the odds of a large hollow.
3
Rattle
A rattle when you shake it usually means loose crystals inside a hollow. Many hollow geodes don't rattle, though.
4
Where you found it
Midwest geodes weather out of limestone and collect in creek beds around Keokuk, Iowa, and in Kentucky and Indiana. Western geodes and thunder eggs come from volcanic rhyolite and tuff.
5
Geode, concretion or thunder egg?
Concretions are solid all the way through. Thunder eggs look like geodes outside but usually have a solid agate core with a star-shaped pattern.
6
Open it cleanly
A soil-pipe chain cutter, often rentable from hardware stores, gives the cleanest break. A hammer on a geode wrapped in a cloth sack works but can shatter it; a rock saw is best if you want to polish the faces. Wear eye protection.

Common look-alikes

Dyed geodes

Hot pink, electric blue, teal or lime interiors are dyed. Look for color pooled in cracks and along band edges. Pale blue can be natural.

'Citrine' geodes

Real quartz, but almost always heated amethyst: a white base with orange or burnt-looking tips is the giveaway.

Resin or clay 'geodes'

Man-made pieces with glued-in crystals scratch easily with steel and feel wrong in the hand.

Trimmed vugs

Crystal pockets cut out of basalt, without a separate geode rind. Natural, but not true geodes.

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Collecting Rules to Know

Most geode sites around Keokuk are on private land: get permission first. Collecting isn't allowed in Iowa's state parks, including Geode State Park. Several pay-to-dig sites nearby charge about $25.
On BLM land, such as the Dugway Geode Beds in Utah, you may collect reasonable amounts for personal use with hand tools. Tunneling is unsafe and not allowed.
Selling rocks collected on BLM land requires a permit, and collecting is banned in national parks.

How to Sell a Geode

Rock shops buy outright or take consignment; expect wholesale-level offers, not retail prices.
Opened geodes are easier to price than unopened ones, which sell as a gamble. Photograph the interior well and sell matched pairs together.
Regional lapidary auctions give real results, but bids for common geodes are often only a few dollars, and heavy pieces lose value to shipping and crating costs.
Disclose any dyeing or heat treatment; it is legally required when you sell.
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Geode Value Questions

Get answers to common questions about rock identification, rockhounding, and using our platform.

Most geodes are worth about $2–$60. Small break-your-own geodes retail for about $3–$25 and nice opened pairs for about $20–$80. Amethyst cathedrals sell by weight at about $10–$56 a pound, so large ones cost hundreds to over $13,000. Resale to a dealer or at auction is usually much lower.

Usually not. Unopened geodes are sold as a gamble, priced mainly by size and the odds of a hollow center. Once opened, the value depends on what's inside, and a matched pair or polished face is worth the most.

Look for a roundish, lumpy rind and a stone that feels light for its size; a rattle is a good sign. Location matters too: creek beds around Keokuk, Iowa, Kentucky and Indiana, or volcanic areas like Dugway, Utah. Only opening it proves it, because many geodes are solid.

A soil-pipe chain cutter gives the cleanest break. You can also put the geode in a cloth sack and strike it with a hammer, use a hammer and chisel, or cut it with a rock saw if you plan to polish it. Wear eye protection.

It's usually a real rock that has been dyed. Neon colors and dye pooled in cracks are the giveaway; natural geode colors are mostly white, gray, brown, pale blue and amethyst purple.

They are real quartz, but almost always heat-treated amethyst; GIA says most citrine is heated. They typically sell for the same or less than amethyst.

On private land you need the landowner's permission. BLM land allows reasonable amounts for personal use, but selling needs a permit. Collecting is banned in national parks and Iowa's state parks.

Sources

Price ranges come from published dealer prices, auction results and the sources below, checked September 25, 2026. Prices move, so treat them as a guide.