Other rare gems

This collection presents mostly « rare gems » or « collector gems », more often not used in jewellery because of rarity or hardness. . Rarity is due to  the quantity available, or a rare color, source or inclusion, or the difficulty to cut the rough into a faceted gem. Microphotographies are taken with an old Olympus microscope and an iphone. These gems are not for sale, but some extra specimens may be available. The collection is visible but stored in a specific location, so please contact me for an appointment.

Some of these gems are exceedinly rare as faceted gems as the milarite from St-Gottard, the proustite,  the kämmererite or the spurrite. Some other great rarities are present as taaffeite, grandidierite, roselite or cancrinite.

> Traitement des pierres / an introduction to gem treatment (GIA)

> Différents effets optiques / Phenomenal stones (GIA)

> Répertoire des propriétés magnétiques des pierres / gemstones magnetism list