![emerald cut davidite](https://www.patrickvoillot.com/wp-content/uploads/2021/03/davidite-taille-emeraude194.png)
oxides
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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![emerald cut davidite](https://www.patrickvoillot.com/wp-content/uploads/2021/03/davidite-taille-emeraude194.png)
![red cuprite from Namibia oval cut](https://www.patrickvoillot.com/wp-content/uploads/2021/03/cuprite-ovale-namibie199.png)
cuprite
Its name comes from the Latin “Cuprum” which means copper, it was discovered by von Haidinger in 1845. The chaloctrichite is a form that looks like thin hair hence the name derived from Greek (copper hair). There are massive varieties mixed with chrysocolla and tenorite
![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
![round cut cassiterite from Bolivia](https://www.patrickvoillot.com/wp-content/uploads/2021/03/cassiterite-taille-ronde-bolivie219.png)
cassiterite
Its name comes from the Greek “kassiterôs”, tin, or the name of the islands “Cassiterides” that produced this tin ore in antiquity, very likely islands very close to present-day Spain that would have given their name to this tin mineral, cassiterite. It is the principal
![gem brookite crystal from Pakistan](https://www.patrickvoillot.com/wp-content/uploads/2021/03/brookite-cristal-pakistan228.png)
![square cut bixbyite](https://www.patrickvoillot.com/wp-content/uploads/2021/03/bixbyite-taille-carree233.png)