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

Ruby — specimen 0276Ruby — specimen 0276

Weight: 0.61 ct; size: 6.33 | 4.36 | 2.79 mm; shape: pear; colour: medium dark strongly purplish red; very slightly brownish. Very clean specimen; good mixed style cut. Source: David Weinberg, Multicolour Gems Ltd.
Bytownite — specimen 0284Bytownite — specimen 0284

Weight: 2.28 ct; size: 10.27 | 8.10 | 5.44 mm; shape: pear; colour: very light yellow. Very clean specimen; good mixed style cut. Source: Gary Eisenberg, Knoxville, Tennessee.
Chromian pyrope — specimen 0289Chromian pyrope — specimen 0289

Weight: 0.37 ct; size: 3.90 | 3.90 | 2.66 mm; shape: octagon; colour: medium dark slightly purplish red; strong. Very clean specimen; good mixed style cut. Source: Michael Asa, Gem Line Inc.
Pargasite — specimen 0294Pargasite — specimen 0294

Weight: 0.70 ct; size: 6.98 | 4.91 | 3.07 mm; shape: oval; colour: medium dark reddish orange; strong. Very clean specimen; good mixed style cut.
Featured
Sanidine

— Most common in felsic volcanic rocks; in volcanic glass; also from mafic, high-temperature contact metamorphic, and hydrothermally altered rocks; from eclogite nodules in kimberlite (Anthony et al., 2001—2005).

Specimen figured

Sanidine — specimen 0017weight: 1.08 ct; shape: oval. Very clean specimen; very good mixed style cut. Source: John Bradshaw, Coast to Coast Rare Stones International.
Sanidine — specimen 0017