News & Library
Research notes, lab updates, events, and gemological insights from our team in Antwerp and Shanghai.
38 article(s) found
EventsALGT Shares Gemstone Testing Expertise with Belgian Jewelry Professionals
This Monday, ALGT’s General Manager and Chief Gemologist, Marc Segers, was invited by Sofie Vanheukelom, President of Studio Goudmijn, to give a lecture at Kasteel van Bokrijk in Belgium…
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IdentificationWhen a 30 ct “Emerald” Turns Out to Be Green Beryl: ALGT’s Gemological Analysis
Recently, ALGT received a bluish green gemstone weighing over 30 ct. The client submitted the stone as an emerald; however, after examination, the Antwerp Laboratory for Gemstone Testing reached a different conclusion…
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IdentificationWhy Not Every Pink-Orange Sapphire Can Be Called Padparadscha
In today’s jewellery market, the naming of many stones as “Padparadscha” is problematic — or, to put it more mildly, does not comply with the internationally accepted grading standards for Padparadscha sapphires…
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ResearchA Rare Untreated Cat’s-Eye Emerald from Brazil Examined by ALGT
ALGT recently examined a remarkable 4-carat emerald displaying a distinct and well-defined cat’s eye effect. Using Raman spectroscopy, we first confirmed that the gemstone is indeed a natural emerald…
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ResearchAt ALGT, Every Single Stone Matters
A truly breathtaking Sri Lankan sapphire jewellery set has just arrived at ALGT. Featuring a necklace, a pair of earrings, and a bracelet, this set is beautifully designed, elegant, and full of charm…
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EventsALGT Attends Pearl Conference in Idar-Oberstein to Follow the Latest Advances in Pearl Identification
As gemologists, it is essential for us to stay up to date with the latest developments in the world of gemmology. That is why our General Manager, Marc Segers, together with CEO Mingyue Yang, travelled to Idar-Oberstein to attend the Pearl Conference…
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ResearchRecently a deep blue 0.71 carat sapphire (heated) was submitted to ALGT for origin report
Recently a deep blue 0.71 carat sapphire (heated) was submitted to ALGT for origin report. According to the chemical analysis and inclusion characteristics, we concluded that the…
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EventsWe are very proud to become the first platinum sponser for F.E.E.G. Symposiums 2024 in Brussels.
We are very proud to become the first platinum sponser for F.E.E.G. Symposiums 2024 in Brussels. Federation for European Education in Gemmology – Symposiums 2024 – 2025 Below some…
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ResearchThis amazing 3.03 cts and 3.15 cts demantoid pair originated from Russia was recently brought in ALGT for research.
This amazing 3.03 cts and 3.15 cts demantoid pair originated from Russia was recently brought in ALGT for research. Since Russian demantoid often occurs as small grains with no…
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