GGTL Laboratories Switzerland

GGTL Laboratories Switzerland The mission of the GGTL laboratories is to analyse gemstones and provide reports for diamonds, colou

Chez GGTL Laboratories Switzerland, nous sommes ravis que le Dr Thomas Hainschwang, gemmologue pluridisciplinaire et co-...
19/06/2026

Chez GGTL Laboratories Switzerland, nous sommes ravis que le Dr Thomas Hainschwang, gemmologue pluridisciplinaire et co-fondateur des laboratoires GGTL, ait partagé son expertise dans le podcast Gemme vous écouter. Une conversation rare avec l'un des principaux spécialistes mondiaux du diamant, à écouter sans attendre.

Merci à Jeanne Goirot pour cette belle invitation !

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At GGTL Laboratories Switzerland, we are delighted that Dr. Thomas Hainschwang, multidisciplinary gemologist and co-founder of GGTL laboratories, shared his expertise on the podcast Gemme vous écouter. A rare conversation with one of the world's leading diamond specialists. Don't miss it.

Thank you to Jeanne Goirot for the invitation !

🎙️ https://open.spotify.com/episode/4aYMDSsWaudCYPaOEtiBdV

A material sold as synthetic has been appearing on the market since late 2023 — spotted in Bangkok, at Tucson, and acr...
12/06/2026

A material sold as synthetic has been appearing on the market since late 2023 — spotted in Bangkok, at Tucson, and across online platforms.

Its characteristic texture has earned it the nickname "honeycomb ruby."

Next week, we'll tell you everything. Stay tuned !

📸 : Raw piece (SGDF-16681) and sphere (SGDF-16682) of sintered ruby. F. Blumentritt.

When a stone costs €5 per carat but shows 8 different metals in its surface coating — that's not a coincidence. That's e...
30/05/2026

When a stone costs €5 per carat but shows 8 different metals in its surface coating — that's not a coincidence. That's engineering.

We analysed a series of surface-coated synthetic moissanites using UV-VIS-NIR spectroscopy and EDXRF.

The results revealed a sophisticated knowledge of plasma deposition that goes well beyond standard gem treatments.

Swipe for the full story. 👉

Micrograph of the week:Yellow anatase crystals and rutile needles in a quartz from Brazil.
22/05/2026

Micrograph of the week:

Yellow anatase crystals and rutile needles in a quartz from Brazil.

Multiphase inclusion (liquid, gazeous CO2 and diaspore) in a sapphire from Sri Lanka (NTE).⁠⁠ ⁠⁠Want to see ...
15/05/2026

Multiphase inclusion (liquid, gazeous CO2 and diaspore) in a sapphire from Sri Lanka (NTE).⁠
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Want to see more micrograph?
👉️ https://www.ggtl-lab.org/

Labradorite needs no help to be beautiful. Or so you'd think.Yet treated cabochons are circulating on the market — and o...
07/05/2026

Labradorite needs no help to be beautiful. Or so you'd think.

Yet treated cabochons are circulating on the market — and our gemologists have identified two very distinct types of treatment: a physical vapour deposition of titanium, detected by EDXRF analysis, and acrylic paint applied directly onto the stone, revealed by infrared spectroscopy. Soluble in acetone.

One is a technical feat. The other is, quite literally, paint.

Both deserve to be disclosed.

Our article, published in Gemmes — Gemmologie & Francophonie, N°4, explores these treatments in depth: their analytical signatures, and what they mean for the ornamental stone market.

Read it here → https://lnkd.in/eXCMqUHx

Féodor Blumentritt, Franck Notari, Antoine GERAUD, Roxanne Stephann, & Candice Caplan

A 3.09 ct natural yellow diamond. A colour that takes more than a glance to understand.Behind every fancy diamond lies o...
30/04/2026

A 3.09 ct natural yellow diamond. A colour that takes more than a glance to understand.

Behind every fancy diamond lies one essential question: is this hue the result of nature, or the mark of a laboratory treatment? It is one of the most complex assessments in modern gemmology — and one of the most consequential for a stone's value.

At GGTL Laboratories Geneva, we issue grading and testing reports for fancy diamonds of every hue — yellow, pink, blue, green, orange, red, and beyond. Each report details colour authenticity, colour origin, and any clarity treatment, in compliance with the highest international standards.
Because a beautiful stone deserves a truth as precise as its light.

🔗 Learn more about our fancy diamond services: ggtl-lab.org/en/diamond-gemstone-pearl-services #2

A diamond… with a surprise inside 💎What looked like a classic inclusion turned into a fascinating gemological puzzle.A v...
16/04/2026

A diamond… with a surprise inside 💎

What looked like a classic inclusion turned into a fascinating gemological puzzle.

A vivid orange cluster, perfectly trapped within the stone, pointed at first to spessartine — until science said otherwise.

Because in gemology, what you see isn’t always what you get. Raman spectra can guide you… but they don’t tell the whole story.

This rare inclusion is most likely an orange pyrope-almandine garnet — a reminder that nature doesn’t follow simple rules.

When chemistry, geology, and light collide, every stone becomes a mystery to solve.

Read more:
👉️ https://ggtl-lab.org/en/news/inclusion-orange-pyrope-almandine-garnet-crystal-diamond
👉️ https://gemmologie-francophonie.com/

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