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

Opal — specimen 0167Opal — specimen 0167

Weight: 1.15 ct; size: 9.02 | 5.40 | 3.79 mm; shape: octagon; colour: medium red; strong. Very clean specimen of ‘fire opal’ variety; step cut style.
Johachidolite — specimen 0174Johachidolite — specimen 0174

Weight: 0.03 ct; size: 2.27 | 1.66 | 1.22 mm; shape: oval; colour: medium light orangey yellow; strong. Very clean specimen; good mixed style cut. Source: David Weinberg, Multicolour Gems Ltd.
Jadeite — specimen 0200Jadeite — specimen 0200

Weight: 3.01 ct; size: 11.87 | 7.82 | 3.56 mm; shape: pear; colour: medium green; slightly greyish. Clean specimen; good cabochon style cut.
Smoky quartz — specimen 0202Smoky quartz — specimen 0202

Weight: 11.11 ct; size: 16.22 | 12.25 | 7.25 mm; shape: octagon; colour: dark reddish orange. Very clean specimen; step cut style.
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