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

Hambergite — specimen 0489Hambergite — specimen 0489

Weight: 0.26 ct; size: 5.15 | 3.86 | 2.54 mm; shape: oval; colour: colourless. Very clean specimen; very good mixed cut style. Source: David Weinberg, Multicolour Gems Ltd.
Phenakite — specimen 0490Phenakite — specimen 0490

Weight: 0.41 ct; size: 5.54 | 4.37 | 2.80 mm; shape: oval; colour: colourless. Very clean specimen; very good Portuguese style cut. Source: David Weinberg, Multicolour Gems Ltd.
Phenakite — specimen 0491Phenakite — specimen 0491

Weight: 0.41 ct; size: 5.56 | 4.41 | 2.51 mm; shape: oval; colour: colourless. Very clean specimen; very good Portuguese style cut. Source: David Weinberg, Multicolour Gems Ltd.
Phenakite — specimen 0493Phenakite — specimen 0493

Weight: 0.78 ct; size: 6.37 | 4.58 | 3.56 mm; shape: rectangle; colour: colourless. Very clean specimen; very good radiant 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