6.48 ct Nigerian Gray Tourmaline — Precision Round Cut

Collector's Note
An unusually colored Nigerian tourmaline with a predominantly gray body color and subtle green flashes as the stone moves. The precision round modified brilliant cut produces a crisp, symmetrical face-up pattern and strong optical performance.

Gemstone Details
Gemstone: Tourmaline
Weight: 6.48 ct
Shape / Cut: Round Modified Brilliant
Measurements: 12.08–12.05 × 7.67 mm
Color: Gray with faint green hints
Transparency: Transparent
Origin: Nigeria
Treatment: None

O50 Collector Evaluation
Otzera 50: 34/50 — Collectible
Face-Up Performance: 78%

Treatment
Tourmaline comes in more colors than almost any other gem, and this stone’s color is natural.

Care & Setting
Tourmaline is suitable for jewelry wear with reasonable care. Clean with warm water, mild soap and a soft brush; avoid sharp impacts and sudden temperature changes.

Digital Gem Passport
Accompanied by an Otzera Digital Gem Passport preserving the gemstone's identifying details and O50 evaluation.