Learn About Tanzanite’s Color

All tanzanite has the rare ability to show two different colors at the same time. Tilt any tanzanite in the light, and you will see a unique mix of blue and violet.

A RANGE OF COLORS

Tanzanite forms in a wide range of colors: from light sky blues and lilacs through to deep indigos and royal blue. Some large tanzanites appear to be pure blue, but in most cases, a closer look will show both colors simultaneously.

PLEOCHRISM: ONE STONE, TWO COLORS

Due to its unique crystalline structure, tanzanite is one of only two known gemstones that clearly exhibits two colors at once. This characteristic (called pleochrism) means a tanzanite can never be pure blue or pure violet color, but rather, always a combination of the two. Rock any tanzanite back and forth – and you will see both colors as the angle of the stone changes.

Occasionally, very large tanzanites display an intense violetish and blue, with flashes of a third color: burgundy.

  • A tanzanite which has more violet than blue is described as “bluish-Violet” or “bV”
  • A blue dominant tanzanite, which reflects more blue than violet, is described as “violetish – Blue” or “vB”

 

  • Tanzanites with deep and highly saturated hue are the rarest and most expensive, while pastel and lighter colored stones are more common.
  • The darkest colors are usually seen in larger sized stones, above 5 carats; however, a large stone with less saturation will have lower value.
  • Smaller tanzanites are usually more lightly colored. It is unusual to find a deeply colored stone in a smaller size.
  • Each tanzanite, no matter its color, is still incredibly rare. Remember that a deep violetish blue tanzanite does not necessarily mean that the stone is better: just that it’s rarer.