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

Zircon — specimen 0212Zircon — specimen 0212

Weight: 0.94 ct; size: 6.10 | 3.85 | 3.20 mm; shape: octagon; colour: medium light green-blue or blue-green; very slightly greyish. Very clean specimen; good step cut style.
Hyacinth — specimen 0221Hyacinth — specimen 0221

Weight: 1.55 ct; size: 8.59 | 4.48 | 3.35 mm; shape: octagon; colour: medium reddish orange; strong. Very clean specimen; very good radiant style cut. Source: David Weinberg, Multicolour Gems Ltd.
Opal — specimen 0227Opal — specimen 0227

Weight: 1.66 ct; size: 12.18 | 5.57 | 3.79 mm; shape: octagon; colour: medium orangey red; very slightly brownish. Very clean specimen of ‘fire opal’ variety; step cut style.
Malaia garnet — specimen 0230Malaia garnet — specimen 0230

Weight: 0.20 ct; size: 3.53 | 3.50 | 2.21 mm; shape: round; colour: light reddish orange; very slightly brownish. Very clean specimen; good brilliant style cut. Source: David Weinberg, Multicolour Gems Ltd.
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