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Blue Eyris Pearls - Pearls from the sea creatures known as abalone are incredibly rare. They cannot be cultured like the pearls from mussels and oysters; abalone are all hemophiliacs. They bleed to death when injected with a nucleus.

The Most Expensive Gemstones in the World Infographic - more on the site.

Rare orange Tanzanite

Tourmaline ! Watermelon sceptered crystal

Chrysacola druzy and Malachite

Morganite

Crocoite

Crystal Formation

Peruvian Pink Opal Natural Stone with Druzy by FenderMinerals

Pyritized Ammonite, Russia / Pearl-Nautilus / Mineral Friends ♥

Tourmaline with Smoky Quartz and Lepidolite. This and other rare mineral specimens for sale on the CuratorsEye.com

crocodile skeletal amethyst crystal

Quartz with Pyrite from Mexico

petrified wood table

Watermelon Tourmaline, pink and green mineral gem stone

spinel_twinning

Polished Quartz with a "sea urchin" of black Ankangite floating inside. There are clusters of Quartz near the surface, some touch the surface, and tiny colorless Fluorapatite tabular crystals around the Ankangite ball. Ankangite is a rare variety of Mannardite. An exceptional inclusion piece from Brazil.

tektite

Doubly terminated, twin, "reverse" scepter Amethyst.

Tennessee Puddingstone / a conglomerate of pebbles of material grading from Chert to Jasper

Black Opal - Australia

Golden Orange Sunstone Crystal Gemstone

Pipe Opal from the Quilpie opal mining are Australia

Rainbow Lattice Sunstone from Mud Tank in the Northern Territory, Australia

Quartz on Flourite: from the 2013 Tucson Gem & Mineral Show (photo by Renate Surh)