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

Agate — specimen 0611Agate — specimen 0611

Weight: 23.20 ct; size: 29.96 | 21.45 | 4.63 mm; shape: oval; colour: medium dark orange; strong. Clean specimen; cabochon style cut..
Rock crystal — specimen 0616Rock crystal — specimen 0616

Weight: 5.70 ct; size: 20.61 | 6.52 | 5.88 mm; shape: octagon; colour: colourless. Very clean specimen; very good mixed style cut. Faceted by Multicolour Gems Ltd.
Rainbow obsidian — specimen 0617Rainbow obsidian — specimen 0617

Weight: 32.97 ct; size: 30.87 | 27.05 | 4.52 mm; shape: oval; colour: black. Clean specimen; excellent cabochon style cut by Nathan Christensen, Lincoln, Nebraska.
Agate — specimen 0619Agate — specimen 0619

Weight: 3.92 ct; size: 13.85 | 10.07 | 3.33 mm; shape: oval; colour: medium dark red; very slightly brownish. Clean specimen; very good cabochon style cut.
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