Sold for: Sign-in or Join (free & quick)
includes Buyer's Premium (BP) 


    Placenticeras costatum
    Late Cretaceous
    Bearpaw Formation
    Alberta, Canada

    Spectacular "Gem" Ammonites are highly prized in museums and collections around the world. This fine specimen dates back 70 million years ago and is an excellent example of what is considered a Canadian national treasure - from the premier fossil locality for gem ammonites. This locality is the only place in the world that produces Ammonite specimens with unbelievable bright, beautiful and iridescent colors. In fact, the preservation is so good that the World Jewelry Confederation gave the fossilized shell material, known as Ammolite, gemstone status in 1981, the same year commercial mining of Ammolite began. The color is primarily a function of the fossil preservation of the shell nacre. Significant deposits of gem-quality Ammolite are only found in the famous Bearpaw Formation in southern Alberta, Canada. This incredible specimen has numerous features which set it apart: First, it shows an abundance of blue and purple coloration on the shell which is not typical for even the most colorful of specimens; Second, the ammonite is quite large, and the fossil is also rather inflated, whereas most of the matrix specimens have been flattened and, although colorful, lack the three dimensional aspect of this museum-quality piece. This stunning jet black matrix measures 43 x 27 x 3 inches (109.22 x 68.58 x 7.62 cm). The gem ammonite itself is an impressive 17 x 16 inches (43.18 x 40.64 cm) and has dominant patches of brilliant blue, purple, green, red and gold. The piece is fitted for hanging with double metal cleat hangers and comes with a Certificate of Authenticity. This specimen is worthy of any fine museum or gallery.

    Condition Report*:

    Condition report available upon request.

    *Heritage Auctions strives to provide as much information as possible but encourages in-person inspection by bidders. Statements regarding the condition of objects are only for general guidance and should not be relied upon as complete statements of fact, and do not constitute a representation, warranty or assumption of liability by Heritage. Please note that we do not de-frame lots estimated at $1,000 or less and may not be able to provide additional details for lots valued under $500. All lots are sold "AS IS" under the Terms & Conditions of Auction.

    Fees, Shipping, and Handling Description: Requires 3rd Party Shipping (view shipping information)

    Sales Tax information  |  Terms and Conditions

    Bidding Guidelines and Bid Increments

    Glossary of Terms

    Auction Info

    Auction Dates
    June, 2013
    2nd Sunday
    Bids + Registered Phone Bidders: 4
    Lot Tracking Activity: N/A
    Page Views: 4,734

    Buyer's Premium per Lot:
    25% on the first $50,000 (minimum $14), plus 20% of any amount between $50,000 and $1,000,000, plus 12% of any amount over $1,000,000 per lot.

    Heritage membership

    Join Now - It's Free

    1. Past Auction Values (prices, photos, full descriptions, etc.)
    2. Bid online
    3. Free Collector newsletter
    4. Want List with instant e-mail notifications
    5. Reduced auction commissions when you resell your
    Consign now
    • Cash Advances
    • More Bidders
    • Trusted Experts
    • Over 200,000 Satisfied Consignors Since 1976
    Consign to the 2017 April 28 Modern & Contemporary Art Signature Auction - Dallas.

    Learn about consigning with us

    The results truly exceeded my expectations, and for this, you both deserve all the credit.
    Dr. David Kirsner,
    Miami, FL
    View More Testimonials receives more traffic than any other auction house website. (Source:

    Video tutorial

    Getting the most out of search

    Recent auctions

    2016 October 12 Illustration Art Signature Auction - Dallas
    2016 October 12 Illustration Art Signature Auction - Dallas
    REALIZED $1,796,721