Natural Grandidierite

The Grandi

Name: The Grandi · Natural Grandidierite
Brand: JDBG GEMS

Grandidierite is a rare magnesium-aluminium borosilicate, first described from southern Madagascar and named after the French explorer Alfred Grandidier. It is one of the ten rarest gemstones on most lists, prized when transparent and free enough to facet.

The Grandi is a 17.40 ct oval, cut in a modified brilliant pattern, and documented in an independent laboratory report as natural grandidierite with no detected treatments.

Rarity Score: 9.8 / 10

Reference stones

Grandidierite · Medici Collection LLC · 764 ct (Guinness Record)

Technical Profile Back← Prev Next →

Weight: 17.40 ct
Cut: Modified brilliant
Colour: Blue-green

Location: Stockholm · Private collection · JDBG GEMS

Species: Natural Grandidierite
Dimensions: 19.99 × 14.31 × 9.95 mm
Shape: Oval
Transparency: Transparent
Treatments: None
Analysis: Microscope · EDXRF · Raman · FTIR · UV/VIS/NIR · LA-ICP-MS
Weight: 17.40 ct
Cut: Modified brilliant
Colour: Blue-green
Phenomena: None
Certificate: Verification in progress