Gemmology
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Saturday, 25 July 2026


Gemmology — gemstones — characteristics, classification, specimens, library
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GEMMOLOGY — GEMSTONES

characteristics, classification, specimens, library

As gemstones we accept cut specimens of crystals of natural mineral species having a visible transparency and certain durability. From over 4800 known minerals (according to data of the International Mineralogical Association), approximately 150 satisfy the above conditions and form crystals of sufficient size to be cut.

The section ‘Classification’ presents descriptions of 171 different kinds of natural gemstones (106 mineral species). The Nickel-Strunz systematic order (10th edition) is used. Since gemmology does not always follow the systematics of minerals in naming, many popular varieties or just ’names’ are listed.

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Classification
Featured

Danburite

— In granite and metamorphosed carbonate rocks associated with hydrothermal activity (Anthony et al., 2001—2005).
Danburite

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. Besides there are 8 specimens of synthetic stones.

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Repository
Topaz — specimen 0585

Some exceptional specimens of gemstones from our ‘Repository’

More specimens of gemstones
Spessartine — specimen 0098
Moonstone — specimen 0099
Amazonite — specimen 0101
Moonstone — specimen 0106

— More from ‘Repository

Currently there are 283 bibliographical references and abstracts to publications with gemmological or mineralogical thematics in the ‘Library’. The section comprises also a glossary with 391 terms.
Library
Glossary

chromium-dravite — species of mineral; see chromium-dravite in ‘Classification’
chrysoberyl — species of mineral; see chrysoberyl in ‘Classification’
chrysoprase — variety of chalcedony, quartz; see chrysoprase in ‘Classification’
citrine — variety of quartz; see citrine in ‘Classification’
Publications

Anthony, J. W., Bideaux, R. A., Bladh, K. W., Nichols, M. C. (Eds), 2001—2005 — Ilvaite — Features the data of ilvaite; from ‘Handbook of Mineralogy’.
Anthony, J. W., Bideaux, R. A., Bladh, K. W., Nichols, M. C. (Eds), 2001—2005 — Allanite-(Ce) — Features the data of allanite-(Ce); from ‘Handbook of Mineralogy’.