Top quality Tanzanite crystal. A very well-formed specimen, saturated coloration, and a very apparent blue-purple color shift. Front and rear faces have a smooth, glassy luster, striated on both sides where a very apparent blue-purple color shift can be seen.

At least 30 individual, emerald-green DIOPTASE crystals sprinkled on a Dolomite matrix. The largest dioptase crystal is 0.3 inches long. Luster is adamantine. Crystals are rhombohedral shape. The specimen is from the famous TSUMEB Mine in Namibia. From the collection of Kim Cathcart.

Cluster of large emerald-green DIOPTASE crystals on matrix. The two largest dioptase crystals are 0.5 inches long. Luster is adamantine. Crystals are rhombohedral shape. The specimen is from the famous TSUMEB Mine in Namibia. Custom base. Minor white Calcite crystals are sprinkled over the specimen.

Specimen of brilliant GOLD crystals on Sericite matrix. The specimen weighs 54 grams (1.9 ounces). Length is 1.8 inches. El Dorado County, California is famous for its gold production since the California Gold Rush in 1849. 

Brilliant GOLD LEAF from the famous Little Jonny Mine in Leadville, Colorado. The gold weighs 1.8 grams (0.063 ounces).