Unheated Tanzanite Ring Gemstone, Flawless Tanzanite Stone, Natural Tanzanite Loose Gem, December Birthstone Wedding Ring Stone

Showcasing an incredible 8.30 Carat unheated crystal, this Natural Bi-Color Tanzanite combines deep ocean blue with warm, golden champagne undertones in a breathtaking display of natural pleochroism. Precision-cut into a crisp, architectural 11.4 x 11.4 mm Asscher shape with a deep 8 mm pavilion, this showpiece gemstone offers bench goldsmiths and custom studio jewelers a standard 11.5mm square footprint that drops smoothly into pre-made or custom high-jewelry mountings.

Mined in the Merelani Hills of Tanzania, this gem is 100% natural and unheated—a rare state that preserves the raw, untouched golden-bronze and blue dichroism that heat treatment destroys. Featuring flawless eye-clean clarity and exceptional step-cut facet symmetry, light bounces through its deep pavilion to create a mesmerizing hall-of-mirrors effect. It is a prized focal point for bespoke engagement rings, luxury statement pendants, or high-end December birthstone creations.

Gemstone Specifications & Attributes:

• Gemstone: Natural Tanzanite (Zoisite)

• Form: Loose Ring / Jewelry Gemstone

• Shape: Asscher Cut (Square Step Cut)

• Dimensions: 11.4 x 11.4 x 8 mm (Standard Calibrated Size)

• Color: Bi-Color (Golden Champagne & Ocean Blue)

• Creation Method: Natural

• Weight: 8.30 CT

• Origin: Tanzania (Merelani Hills)

• Treatment: None (100% Natural / Unheated)

• Quantity: 1 Piece

• Grade: AAA

• Clarity: Eye Clean

• Transparency: Transparent

• Drilling: Undrilled

• Cut Grade: Excellent Step Cut

• Hardness: 6.5 - 7.0 on Mohs Scale

• Optical Effect: Rare Unheated Bi-Color Pleochroism & Step-Cut Mirror Reflections

• Certification: Available upon request

• Calibrated: Yes (Standard 11.5x11.5 mm Footprint)

Jeweler Benefits & Bench Advantages:

• Standard 11.5x11.5 mm Footprint: Precision calibrated square dimensions fit seamlessly into standard 11.5mm Asscher-cut prong, halo, or bezel settings.

• Rare Unheated Collector Status: Less than 1% of tanzanite remains unheated, making this natural golden-blue variety highly sought after by luxury collectors and bespoke designers.

• Flawless Step-Cut Clarity: Eye-clean interior guarantees crisp step reflections with zero internal inclusions to disrupt light paths.

• Single-Source Provenance: Sourced directly from the iconic Merelani Hills deposit in Tanzania, the world's sole source for gem tanzanite.

Goldsmith & Setting Advice:

• Metal Pairings: Exceptional in 18k yellow gold or rose gold to emphasize the golden champagne tones, or in platinum / white gold to create an icy contrast against the blue body color.

• Bench Handling: Set carefully using corner prongs, V-prongs, or protective bezel frames to safeguard the corners. Cleans safely with warm soapy water and soft brushes; avoid ultrasonic cleaners and extreme sudden heating.