Unheated Tanzanite Crystal Specimen from Merelani, Tanzania – 10.02 carats

A rare and highly collectible unheated tanzanite crystal showcasing natural pleochroic coloration in soft violet and subtle golden-brown tones. This well-formed crystal displays a classic elongated prism habit with a naturally terminated top and excellent vertical striations along the prism faces.

Unlike heated material, this crystal retains its original trichroic character, revealing multiple color directions depending on viewing angle through a dicrhoscope or polarized light source—an exceptional feature prized by collectors. The upper portion shows greater clarity and transparency, while the lower section contains natural inclusions and growth features that document its formation. A beautiful and authentic example of natural, unheated tanzanite directly from the Merelani Hills.

Location: Merelani Hills, Tanzania
Weight: 10.02 carats
Measurements: 19mm x 8mm x 5mm
Crystal System: Orthorhombic
Mineral Class: Sorosilicate (Zoisite Group)