![“ De Beers Centenary “ diamond](https://www.patrickvoillot.com/wp-content/uploads/2021/03/centenary192.png)
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Je vous emmène à travers mes vidéos découvrir mon expérience acquise depuis plus de 30 ans a silloner le globe entier à la recherche de pierres précieuses, de rencontre mémorables mais aussi de difficulté parfois …
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![“ De Beers Centenary “ diamond](https://www.patrickvoillot.com/wp-content/uploads/2021/03/centenary192.png)
![rock crystal from Perou](https://www.patrickvoillot.com/wp-content/uploads/2021/03/quartz-cristal-de-roche-perou207.png)
rock crystal
The name quartz comes from a slavic word meaning “hard”. Rock crystal comes from the Greek “krystallos” meaning ice, because the ancients believed that it was “eternal ice”. It is a mineral, often regarded as a rock as it is widespread in various aspects and
![citrine from Brazil, oval cut](https://www.patrickvoillot.com/wp-content/uploads/2021/03/citrine-quartz-ovale-bresil206.png)
![cinnabar crystals from China](https://www.patrickvoillot.com/wp-content/uploads/2021/03/cinabre-cristaux.jpg)
![yellow chrysoberyl from Sri Lanka oval cut](https://www.patrickvoillot.com/wp-content/uploads/2021/03/chrysoberyl-taille-ovale-sri-lanka218.png)
chrysoberyl
Known since antiquity as a “golden beryl”, its name derived from the Greek “khrusos” for gold. Two popular varieties are appreciated gems: the golden yellow variety and the red / green which is called alexandrite. Most chrysoberyls are golden – yellow to brown – green
![chalcopyrite cut in cabochon](https://www.patrickvoillot.com/wp-content/uploads/2021/03/chalcopyrite-cabochon213.png)
chalcopyrite
Its name comes from the Greek “chalcos”, which means copper and pyrite: this is a copper pyrites. It was identified in 1725 by Henckel. Chalcopyrite may contain gold in small quantities, it is then exploited for this precious metal.