
Alexandrite
Alexandrite is a rare color-changing chrysoberyl gemstone, prized in the minerals category for its dramatic shift from green in daylight to red under incandescent light.
Estimated value as of 2026 ยท Source: Average retail for 1-carat natural alexandrite from multiple gem pricing sources
Fun Fact
The largest faceted alexandrite ever mined, at 65.7 carats, is housed in the Smithsonian Institution .
Price History
More in Nature

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.

Stepping Stone
A garden stepping stone is a decorative concrete or stone paver used to create pathways through lawns, gardens, or patios, often featuring embossed designs like flowers, animals, or verses.

Fossil Tyrannosaurus Rex Skeleton (Stan)
Nearly complete T-Rex skeleton auctioned for research and display.

Californium-252 (per gram)
Rare synthetic element produced in nuclear reactors, the rarest element in practical use.