Extremely Rare Grandidierite Ball Sphere From Madagascar - 25.45 Carats - 1.6cm minerals It is a star formation

It is a star formation and is polished

Nicely terminated with lots of blue Dumortierites inside

Beautiful black Tourmaline necklace with fine black beads measuring from 10-12mm in diameter

though the shells resemble that of a nautilus

Stone is 7 x 7 mm

Extremely Rare Grandidierite Ball Sphere From Madagascar - 25.45 Carats - 1.6cm minerals It is a star formationDescription: This is one of the rarest minerals in the world, a fine greenish blue Grandidierite sphere from Madagascar. Fine specimen, and is considered one of the 10 rarest gemstones. Location: Mandrare, Betroka, Madagascar Size: 1. 6 Centimeters diameter Weight: 25. 45 Grams