How Much Is an Ammonite Worth?
Ammonite value: about $2–$150 for most ammonites; $1,000–$20,000+ for large, rare or gem-quality pieces
Most ammonites are inexpensive: small polished and iridescent ammonites from Madagascar and Morocco sell for about $2–$20, and polished 4–7 inch Cleoniceras for about $39–$145. Prices climb with size, rarity and colorful original shell: large display pieces and clusters list at about $950–$4,500, small pieces of Alberta ammolite at $35–$275, and whole ammonites preserved as ammolite at $19,500 or more. Resale is far lower than retail: at 2026 Minnesota auctions, lots of five small polished ammonites closed at $7–$18.
Get a Free Photo Estimate
Upload a clear photo. Ruby Glint identifies the specimen, then gives a value range based on its type and size. It is an estimate, not an appraisal.
Ammonite Prices by Type (2026)
Dealer asking prices, September 2026, plus winning bids at Minnesota lapidary auctions where marked.
| Type | Details | Typical price |
|---|---|---|
| Moroccan pairs and goniatites | Small pyritized cut pairs (about 1½ in) and polished goniatite 'buttons' sold in bulk | Typical price: $3–$12 |
| Small iridescent Madagascar ammonites | Red or silver 'flashy' shell, ¾–2½ in, sold in bulk | Typical price: $2–$20 |
| Polished Madagascar ammonites | Whole Cleoniceras 3–9 in, and cut halves 3.7–9.2 in that show the chambers | Typical price: $19–$245 |
| Russian pyritized ammonites | Iridescent Quenstedticeras, about 2–2½ in | Typical price: $45–$49 |
| English Jurassic ammonites | Dactylioceras singles and small Promicroceras clusters; larger clusters and plates, including Dorset | Typical price: $25–$275; $395–$1,950 |
| Large display and rare ammonites | 12–18 in Madagascar and Russian pieces; a 7.3 in South Dakota heteromorph (uncoiled ammonite) | Typical price: $950–$4,495 |
| Alberta ammolite | Polished pieces of gem ammonite shell, about 1–3½ in; one 5.7 in piece | Typical price: $35–$275; $750 |
| Whole ammonites preserved as ammolite | Canadian ammonites with gem-quality shell, one 12.6 in; rare dealer listings | Typical price: $19,500–$21,000 |
| Auction resale | Lots of five small polished Madagascar ammonites; single ammonites and clusters; winning bids, Minnesota 2026 | Typical price: $7–$31 a lot |
Private sellers get far less than these asking prices: at 2026 Minnesota lapidary auctions, lots of five small polished Madagascar ammonites closed at $7–$18, and single ammonites and clusters up to 1 lb 10 oz at $19–$31. The five-figure ammolite ammonites are rare dealer listings, not typical values.
What Makes an Ammonite Worth More
The factors buyers and dealers actually price on.
Type and locality
Common Madagascar and Moroccan ammonites sell for a few dollars. English Jurassic clusters, Russian iridescent clusters and US heteromorphs (uncoiled ammonites) run hundreds to thousands.
Size
Price climbs steeply with size: polished Cleoniceras run about $39 at 4 in, $145 at 6.8 in, $225–$245 at 8.4–8.8 in and $950 at 16 in.
Iridescent shell
Original shell with color play adds value. Small 'flashy' Madagascar ammonites cost $2–$20, while Alberta ammolite, a gem made from ammonite shell, costs $35–$75 for a 1–1½ in piece.
Preparation and display
Cutting and polishing shows the chambers, and cut halves sell by size for $19–$215. Pieces prepared as clusters or plates cost more: larger English clusters and plates list at $395–$1,195, against $35 for a single Dactylioceras.
Repairs and composites
Minor, disclosed repairs are often accepted; one guide suggests up to about 10% in areas that don't matter for identification. Pieces built from small real fragments plus carved stone are fakes.
Is It Real, Repaired or a Fake?
Casts, composites and undisclosed repairs turn up among real ammonites. Look for several of these signs together, not just one.
- 1
Matrix contact
Where the shell meets the rock, look for a sharp, even seam or a color break. The fossil and the rock should look like they formed together.
- 2
Bubbles
Under a 10× loupe, tiny round pits under half a millimeter point to cast resin.
- 3
Suture lines
Check that the chamber and suture lines stay consistent across a polished face. Breaks in the pattern deserve a closer look.
- 4
Glue lines
Fakes built from small real fragments and carved stone usually show glue lines and changes in the rock.
- 5
UV light
Resin, glue and plaster often glow differently from rock under a UV flashlight. Paint can hide this, so pair UV with a loupe.
- 6
Ask about repairs
Ask how much is repaired and where, and get the answer in writing before you buy an expensive piece.
- 7
What not to do
Skip acetone and heat tests on anything you want to keep or sell; they can damage a real fossil.
Common look-alikes
Resin casts
Cast copies of real ammonites, sometimes set into real rock. Look for bubbles and a seam where the cast meets the rock.
Composites
A real fragment extended with carved stone and glued together, as documented for fake Heteroceras ammonites.
Orthoceras and ammonite 'sculptures'
Moroccan decor blocks that combine polished Orthoceras and ammonites. They sell as decor: two brought $18–$20 at a 2026 auction.
Iridescent Madagascar ammonites
Colorful shell like ammolite, but small pieces sell for $2–$20, while Alberta ammolite costs about $35 or more for a 1-inch piece. Check the locality before paying ammolite prices.
Not sure what you have? Identify it free from a photo.
Collecting Rules to Know
- In the US, ammonites count as invertebrate fossils: on BLM land you may collect a reasonable amount without a permit, up to 25 pounds a day, with hand tools and for personal use only. They may not be sold or bartered.
- National forests allow the same kind of casual collecting (up to 25 pounds a day and 100 pounds a year) except in national monuments, and those fossils can't be sold either.
- Collecting fossils is prohibited in national parks, and casual collecting isn't allowed on national wildlife refuges.
- Federal law bars selling fossils removed from federal land, except ones lawfully owned before March 30, 2009. On private land, get the owner's permission first.
How to Sell an Ammonite
- Expect far less than retail: at 2026 Minnesota lapidary auctions, lots of five small polished ammonites closed at $7–$18.
- Give the species if known, the locality, size and any repairs, and say whether it's a whole ammonite, a cut half or a pair.
- Specialist fossil dealers list large clusters, heteromorphs and ammolite at hundreds to tens of thousands of dollars, but a dealer buying from you will offer well below those prices.
- Don't sell ammonites collected on BLM or Forest Service land.
- In the Ruby Glint app you can list ammonites in the marketplace and chat directly with buyers.
Identify, value and sell your finds
Scan a specimen for its name and a value range, keep it in your collection, and list it in the marketplace to chat with buyers.
Ammonite Value Questions
Get answers to common questions about rock identification, rockhounding, and using our platform.
Most sell for about $2–$150: small Madagascar and Moroccan pieces cost a few dollars, and polished 4–7 inch Cleoniceras about $39–$145. Large display pieces and rare types list at about $950–$4,500, and whole ammonites preserved as ammolite at $19,500 or more.
At dealers, about $2–$20 for small iridescent ones, $39–$145 for 4–7 inch polished Cleoniceras and $225–$245 at 8–9 inches; a 16-inch one listed at $950. Cut halves run $19–$215 by size.
Polished Alberta ammolite pieces of about 1–1½ inches list at $35–$75, and flashier pieces up to about 3½ inches at $49–$275; one 5.7-inch piece listed at $750. Whole ammonites preserved as ammolite list at $19,500 and up.
Cutting and polishing shows the chambers inside the shell. Dealers sell single halves for $19–$215 depending on size, and small Moroccan cut pairs for about $12.
Check where the shell meets the rock for seams or color breaks, look for tiny bubbles under a 10× loupe, and see that suture lines stay consistent across a polished face. A UV flashlight can show resin or glue; avoid acetone and heat tests.
On BLM land and in most national forests, yes, in small amounts for personal use: up to 25 pounds a day, and you can't sell them. Collecting is banned in national parks, and private land needs the owner's permission.
Size, rarity and display quality. A 7.3-inch South Dakota heteromorph lists at $4,495, and a 12.6-inch ammonite preserved as gem ammolite at $19,500.
Related guides
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.
- FossilEra: Ammonite fossils for sale
- FossilEra: Ammolite for sale
- BLM: Can I collect fossils?
- eCFR: 43 CFR Part 49, Subpart I (casual collecting)
- eCFR: 36 CFR Part 291 (fossils on national forests)
- 16 U.S.C. 470aaa-5: Prohibited acts (Cornell LII)
- GoFossilHunting: How to tell if a fossil is fake
- Deposits: Fossil fakes and their recognition (2015)
- Fossil Driven: How to spot fake fossils
- Auction Masters: Beaver Bay lapidary auction results (April 2026)