What Is Tanzanite?

Tanzanite is a blue-to-violet variety of the mineral zoisite (Ca₂Al₃(SiO₄)₃(OH)), discovered in 1967 in northern Tanzania. It is 1,000 times rarer than diamonds and prized for its trichroic color-changing properties (displaying blue, violet, and burgundy hues from different angles).

Key Geological Characteristics

• Chemical Composition: Calcium aluminum hydroxy silicate.

• Hardness: 6.5–7 on the Mohs scale (softer than sapphire; best for pendants and earrings).

• Crystal System: Orthorhombic (forms in prismatic crystals).

• Sources: Found only in the Merelani Hills, Tanzania (near Mount Kilimanjaro).

Tanzanite’s Color: The Science Behind Its Beauty

Tanzanite’s mesmerizing color comes from vanadium impurities and heat treatment:

Natural vs. Heat-Treated Tanzanite

Trichroism: The Triple-Color Effect

• Blue (when viewed along one axis).

• Violet (when tilted).

• Burgundy/Red (rarely seen in some angles).

Note: The finest tanzanite exhibits a saturated "velvet blue" with strong violet flashes.

Tanzanite’s Discovery & Rarity

• 1967: Discovered by Maasai herders and later identified by gemologist Manuel d’Souza.

• Single Source: Only found in a 4km x 2km mining area in Tanzania.

• Estimated Lifespan: Mines may be depleted within 20–30 years, increasing its rarity.

Fun Fact: Tiffany & Co. named it "Tanzanite" and popularized it globally in 1968.

Tanzanite Value: Grading & Pricing Factors

1. Color (Most Important Factor)

• Top Grades: Vivid violet-blue (AAA/AAAA).

• Commercial Grades: Lighter or grayish tones (A/AA).

2. Clarity

• Eye-Clean: Highest value (minor inclusions acceptable).

• Heavily Included: Lower value (visible fractures).

3. Carat Weight

• Small Stones (1–5 ct): Common in jewelry.

• Large Stones (10+ ct): Rare; exponentially more valuable.

4. Cut Quality

• Best Cuts: Oval, cushion, or emerald step-cuts to maximize color.

• Poor Cuts: May appear washed out or too dark.

Price Range: $200–$1,500 per carat (top-quality stones can exceed $2,000/ct).

Tanzanite Jewelry: Styles & Care

Popular Designs

• Solitaire Rings: Often set in white gold/platinum to enhance color.

• Pendant Necklaces: Protects the stone from scratches.

• Statement Earrings: Showcases trichroism beautifully.

Durability Concerns

• Avoid Ultrasonic Cleaners: Can cause fractures.

• Store Separately: Prevent scratches from harder gems.

• Gentle Cleaning: Use mild soap and a soft brush.

Metaphysical Properties & Symbolism

• Transformation: Linked to spiritual growth and new beginnings.

• Intuition: Believed to enhance psychic abilities (third eye chakra).

• Prosperity: Called the "gemstone of wealth" in some cultures.

Why Tanzanite Is a Collector’s Dream

With its limited supply, mesmerizing color, and increasing rarity, tanzanite is a once-in-a-generation gemstone. Whether as an investment or a statement jewel, it embodies nature’s fleeting beauty.

Explore our Tanzanite Collection for certified, ethically sourced gems.