Moissanite vs. Tanzanite: Brilliance vs. Rarity — Which Stone Wins?

Tanzanite was discovered in 1967 in the foothills of Mount Kilimanjaro in Tanzania — the only place on earth where it exists. Its deep blue-violet color, which shifts between blue and purple depending on the viewing angle and lighting, is genuinely unlike any other gemstone. Tiffany & Co. named it and introduced it to the world, and it has been one of the most coveted colored gemstones ever since.

The fact that tanzanite exists in only one location on earth — a deposit estimated to be exhausted within the next few decades — gives it a rarity that no lab-grown stone can replicate. Moissanite is the opposite of rare. It is produced in laboratories to precise specifications, available in consistent quality, and priced to reflect its production cost rather than its scarcity. What it offers instead of rarity is optical performance — the most brilliant, most fiery gemstone available at any price point.

Tanzanite's Critical Limitation: Fragility

Tanzanite scores 6–6.5 on the Mohs hardness scale — softer than quartz, which means it will be scratched by dust, sand, and many everyday surfaces. More significantly, tanzanite has perfect cleavage in one direction, which means it can split cleanly along a crystal plane if struck at the right angle. Gemologists consistently advise against tanzanite in engagement rings worn daily.

VVS1 moissanite at Mohs 9.25 has no such limitations. It will not scratch from any material encountered in daily life, has no cleavage planes that make it vulnerable to splitting, and is thermally stable under any conditions encountered in normal wear. When you buy moissanite engagement rings online from Moissanite Shine, you are choosing a stone built for exactly this kind of lifelong daily performance.

The Color Question

Tanzanite's blue-violet color is its defining characteristic — a deep, saturated hue that shifts between blue and purple depending on the viewing angle (a property called pleochroism). The finest tanzanite is a vivid, deeply saturated blue-violet that is genuinely extraordinary.

Standard certified moissanite is completely colorless (DEF). However, colored moissanite — including blue and teal options — is available and delivers moissanite's extraordinary optical performance in a colored stone. For buyers who want color and durability, colored moissanite is worth considering.

Price Comparison

High-quality tanzanite commands significant prices — $300–$1,200 per carat for fine stones, with exceptional examples reaching much higher. Affordable moissanite engagement rings from Moissanite Shine — D-color, VVS1, Excellent cut — are available at a fraction of this price for equivalent or larger carat weights. For buyers who want maximum visual impact per dollar spent, moissanite jewelry delivers significantly better value.

The Investment Argument

Some buyers are drawn to tanzanite as an investment, reasoning that its finite supply will drive prices higher as the mine approaches exhaustion. This is a legitimate consideration, but it applies to tanzanite as a collector's stone rather than as a daily-wear engagement ring. A tanzanite ring worn daily will develop surface damage that reduces its value as a collector's piece. If you want tanzanite as an investment, it belongs in a safe, not on your finger.

Which Should You Choose?

Choose tanzanite if you are drawn specifically to its blue-violet color and its rarity, and if you plan to wear it in a setting that protects it from daily impact — earrings, a pendant, or a ring worn for special occasions. Understand its fragility and care for it accordingly.

Choose moissanite if you want a stone that is extraordinary every day — maximum optical performance, daily-wear durability, and independent GRA certification backed by a lifetime warranty moissanite rings from Moissanite Shine. For an engagement ring worn daily for decades, moissanite is the more practical and ultimately more satisfying choice.

Explore our full collection of moissanite rings for sale and moissanite earrings. For more comparisons, see our guides on moissanite vs. opal and moissanite vs. alexandrite.