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 0211Opal — specimen 0211

Weight: 1.60 ct; size: 10.10 | 6.81 | 3.63 mm; shape: octagon; colour: medium orangey red; very slightly brownish. Very clean specimen of ‘fire opal’ variety; step cut style.
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.
Featured
Actinolite

— Produced by regional or contact metamorphism of magnesium carbonate, mafic, or ultramafic rocks (Anthony et al., 2001—2005). Faceted specimens are extremely rare.

Specimen figured

Actinolite — specimen 0075weight: 1.48 ct; shape: oval. Very clean specimen; mixed style cut; good polish. Source: John Bradshaw, Coast to Coast Rare Stones International.
Actinolite — specimen 0075