Limestone Fossil
$7.95
A limestone fossil is a sedimentary rock specimen containing embedded marine fossils, commonly sold for educational purposes as a pack or large display piece.
Estimated value as of 2026 · Source: Home Science Tools retail price for large fossiliferous limestone specimen
Price History
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$27 million
Californium-252 (per gram)
Californium-252 is a synthetic radioactive element produced in nuclear reactors, valued as an exceptional neutron source for medical and industrial applications.
$6.1B
Dog Collar
A dog collar is a band worn around a dog's neck, typically made of nylon or leather, used for identification, control, and attaching leashes.
$31.8M
Fossil Tyrannosaurus Rex Skeleton (Stan)
Nearly complete T-Rex skeleton auctioned for research and display.
$5M
Moon Rock Sample (From Apollo 17 Mission)
Lunar basalt specimen collected during humanity's final Apollo mission in 1972.