Opalized 80 million years old Ammonite measuring 2 ft. in diameter, discovered near Alberta, Canada

Opalized 80 million years old Ammonite measuring 2 ft. in diameter, discovered near Alberta, Canada

Called the Royal One, the 306-carat, gem-quality black opal was kept hidden for 14 years by a miner who discovered it in the Australian outback. It is almost double the size of the Aurora Australis, found in 1938, which was valued at $1 million in 2005.

$3 Million Black Opal Goes on Sale in Las Vegas

Called the Royal One, the 306-carat, gem-quality black opal was kept hidden for 14 years by a miner who discovered it in the Australian outback. It is almost double the size of the Aurora Australis, found in 1938, which was valued at $1 million in 2005.

Topaz with lepidolite. Most topaz come from pegmatites. This large crystal capped with lepidolite is naturally blue. This is rare in nature, however, and most blue topaz is man-made by irradiating and heating colorless or yellow-brown topaz.

Topaz with lepidolite. Most topaz come from pegmatites. This large crystal capped with lepidolite is naturally blue. This is rare in nature, however, and most blue topaz is man-made by irradiating and heating colorless or yellow-brown topaz.

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