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Unheated Tanzanite is a naturally occurring gemstone, meaning it has not undergone any heat treatment to enhance its color. It's known for displaying a variety of colors, including blue, purple, and green, due to a phenomenon called trichroism, where the stone appears different colors when viewed from various angles. Unheated Tanzanite is considered rare, with many stones being valued for their natural, mixed colors and pastel tones.

Here's a more detailed look at Unheated Tanzanite:

Natural and Untreated:

Unheated Tanzanite is exactly as it was formed in nature, without any alteration through heat treatment.

Trichroism:

This gemstone displays multiple colors within a single stone, with the hues shifting depending on the viewing angle.

Color Variety:

While traditionally known for blue-violet hues, unheated Tanzanite can exhibit a spectrum of colors, including peachy, teal, lavender, and other pastel tones.

Rarity:

Tanzanite itself is rare, and unheated Tanzanite, especially clear specimens, is even more so.

Value:

The value of Tanzanite, whether heated or unheated, is determined by factors like carat, cut, clarity, and color, as well as its source.

Origin:

Tanzanite is found exclusively in Tanzania, East Africa, in the remote area of Merelani, near the foothills of Mount Kilimanjaro.

Heat Treatment:

Heat treatment is typically used to remove brown or yellow tones and enhance the blue hue, but it doesn't change the basic color of the stone.