In the past, coloured gemstones and diamonds were often examined in natural daylight, but reproducing such specific lighting conditions was challenging. Some impractical methods had been suggested, like grading only during specific hours or facing northward, especially during cloudy weather.
The Swiss Gemmological Institute SSEF is regularly testing batches of tiny calibrated coloured stones for the Swiss watch industry similar to our testing service for melée diamonds. Testing such small coloured gemstones is challenging, starting with the handling of such small stones to analytical restrictions
Petrology, geothermobarometry and geochemistry of granulite facies wall rocks and hosting gneiss of gemstone deposits from the Mogok area (Myanmar)
Petrology, geothermobarometry and geochemistry of granu […]
Gemstones have been used in jewellery for millennia, with their history dating back to ancient civilizations. From Egypt to Mesopotamia, India to China, Europe and the Americas, gemstones have held deep cultural significance and have been treasured for their inherent beauty and mystical properties.
Coral-ID: A forensically validated genetic test to identify precious coral material and its application to objects seized from illegal traffic
Coral-ID: A forensically validated genetic test to iden […]
Gemmology is a science with its foundations more than a hundred years ago, specifically driven by the emergence of synthetic stones and cultured pearls in the gem trade in the early 20th century.
In 1298 AD, the king of Hungary Andreas II presented to his wife Queen Agnes a stone-set wooden altar piece as a royal wedding present. This small medieval artwork, known today as the Königsfelder diptychon, was originally made in Venice.
From time to time, we get a flashback in gemmological history. This is specifically the case when we receive an antique ring with an ‘early’ Verneuil synthetic ruby showing strongly curved growth bands, or, as in the past few months, when clients submit us doublets.