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.
Tourmaline is one of the most famous semi-precious gem in the world. The variety of colors is stunning. Some are very common as the black Schorl, but some varieties are highly prized by jewellery, some other come from only one source and are very scarse. The collection brings together some of the rarest members as Vanadium and Uambara dravite, the cuprian Paraiba and the Fluor-Lidicoatite.
Have a look at the extraordinary Bruce Fry collection of tourmaline
Dravite Usambara tourmaline from Umba Valley, Tanzania.
This tourmaline is so special that it became a reference, the « Usambara effect ». This stone contains chrome and vanadium and presents a strong pleochroism and a unique color change. With direct cold and incandescent light, stone is green. With transmitted light the gem is green on one axis and red on the other in cold light. But with incandescent light the crystal becomes red on both axis. A dichromatic color change. These stones become scarce.
1) direct light (cold led or warm incandescent same color, green)
2) transmitted cold led y axis, strong pleochroism color is purple
3) transmitted cold led x axis, color is green
4) incandescent warm light transmitted x axis, color changes to red
This vanadium dravite tourmaline is an absolute rarity as only a view came to the market. Looking as a tsavorite. It comes from Southern Madagascar, Gogogo-Bekily area. Flawless!
A small « canary » yellow dravite from Africa, country undetermined. Yellow is one of the rare tourmaline color.
Cuprian Elbaïte, Paraiba Tourmaline is one of the most sought after gem in high jewelry. It was discovered In 1980′ in Paraiba state, Brazil. The Brazilian source is extinct. New deposit were found in Mozambique and Nigeria, but it didn’t influence prices.
The biggest stone is slightly included but the green hue color is amazing, and brilliance is good. It is untreated, and from the original Brazilian source, a great rarity.
The brilliant cut is very small but perfect hue brilliance and clarity, untreated. Even in such size it is now a rarity.
The two others in green and bluish hue are said from Brazil but could be from the more recent african source.
This very rare cuprian Elbaite comes from the Batalha mine, Brazil, the origin of the famous Paraiba Tourmaline. It presents unique and beautiful platelet copper inclusions.
Elbaïte rubellite. The rubellite is one of the sought after tourmaline in jewelry because it’s rare color is very close to ruby.
Fluor-Liddicoatite is one of the rarest tourmaline variety. This specimen comes from Fianarantosa, Madagascar.
Chrome tourmaline contains chrome and vanadium. it comes from East Africa and is one of most valuable in jewellery.