According with a hardness of 7 to 8, Grandiderite could be used in jewelry. But the gemme quality is extremely rare and locate in particular in Madagascar. Small and low purity samples were found in Sri Lanka, Namibia and Malawi. Therefore, the Grandiderite is a stone of collectors.
Discovered early in the 20th century by Alfred Lacroix, it pays tribute to the French naturalist and explorer Alfred Grandidier.
To date, the largest known gemstone cut stone weighs 5.84ct but according to our sources a new Grandidierite of more than 6 ct would have been updated.