![hauyne oval cut](https://www.patrickvoillot.com/wp-content/uploads/2021/03/hauyne-taille-ovale164.png)
blue
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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![hauyne oval cut](https://www.patrickvoillot.com/wp-content/uploads/2021/03/hauyne-taille-ovale164.png)
![emerald cut grandidierite](https://www.patrickvoillot.com/wp-content/uploads/2021/03/grandidierite-taille-emeraude169.png)
grandidierite
Discovered at Andrahomana, near Fort Dauphin in Madagascar. Its name honors the French explorer Alfred Grandidier (1836-1912).
![gilaite in quartz cushion cut](https://www.patrickvoillot.com/wp-content/uploads/2021/03/gilalite-quartz-coussin170.png)
![exceptional blue cut euclase from Colombia](https://www.patrickvoillot.com/wp-content/uploads/2021/03/euclase-taille-emeraude-colombie178.png)
![cabochon of dumortierite from Africa](https://www.patrickvoillot.com/wp-content/uploads/2021/03/dumortierite-cabochon-afrique187.png)
dumortierite
Its name honors Eugene Dumortier, a paleontologist from Lyon (France )(1802-1873). It occurs most commonly as quartz inclusions, it is then called “blue aventurine”.
![oval cut kyanite from Nepal](https://www.patrickvoillot.com/wp-content/uploads/2021/03/cyanite-ovale-nepal197.png)
kyanite
Its name recalls its dominant color : blue in Greek (cyan). Sometimes colorless, but generally blue to bluish green, this gemstone has a hardness ranging, with its texture in plans, from 4.5 (direction of elongation) at 6 to 7 (perpendicular to the elongation). It also