Gemmology
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Repository

Some exceptional specimens of gemstones from our ‘Repository’

Repository


The section ‘Repository’ contains data and photos of 760 specimens of gemstones. The smallest is just 1.96 mm (0.02 ct) ruby from Mozambique, and the largest — 70.11 mm (326.60 ct) rock crystal from Africa.

Additionally there are 8 specimens of synthetic stones.

More specimens of gemstones

Sapphire — specimen 0148Sapphire — specimen 0148

Weight: 0.18 ct; size: 4.99 | 2.54 | 1.97 mm; shape: marquise; colour: colourless. Very clean specimen; good mixed style cut. Source: David Weinberg, Multicolour Gems Ltd.
Bowenite — specimen 0152Bowenite — specimen 0152

Weight: 5.12 ct; size: 14.07 | 10.03 | 4.85 mm; shape: oval; colour: medium yellow; very slightly brownish. Clean specimen; very good cabochon style cut.
Moonstone — specimen 0162Moonstone — specimen 0162

Weight: 0.85 ct; size: 7.04 | 5.03 | 3.18 mm; shape: oval; colour: medium reddish orange; slightly brownish. Clean specimen; cabochon style cut.
Moonstone — specimen 0163Moonstone — specimen 0163

Weight: 1.00 ct; size: 6.95 | 5.00 | 3.89 mm; shape: oval; colour: medium reddish orange; slightly brownish. Clean specimen; cabochon style cut.
Featured
Cordierite

— In thermally metamorphosed argillaceous sediments and regionally metamorphosed schists, gneisses; in mafic igneous rocks and granites (Anthony et al., 2001—2005). The gemstone bears the name iolite.

Specimen figured

Cordierite — specimen 0214weight: 0.18 ct; shape: oval. Very clean specimen; good mixed style cut. Source: Gary Eisenberg, Knoxville, Tennessee.
Cordierite — specimen 0214