Canary Tourmaline, 1.89 carats – (Ref: GEMTOU-0022)

Description

Yellow « Canary » tourmaline, 1.89 carats.

Weight: 1.89 carats
Dimensions (Lxlxh) : 8,42 x 7,43 x 4,46 mm
Color: yellow
Shape: oval
Clarity: Moderately included
Geographic origin: Africa
Treatment: none

«Canary» yellow tourmaline is a rare variety of elbaite tourmaline renowned for its intense yellow color, ranging from a bright lemon yellow to a deep golden yellow. This exceptional hue results from a particularly high concentration of manganese (the stone’s primary chromophore) combined with low levels of titanium and virtually no iron. This unusual chemical balance produces a very pure and saturated color, free of the brownish or greenish undertones frequently seen in other yellow tourmalines.

Spectroscopic studies have shown that interactions between manganese and titanium within the crystal structure are responsible for the selective absorption of certain wavelengths, thereby producing the vivid and luminous color signature characteristic of «Canary» stones. Some crystals naturally exhibit yellow-green, orange, or brown-yellow tones, but much of the material is heated to approximately 500–550 °C to reduce the brown components and intensify the pure yellow known as «Canary».

The exceptional saturation of this color is also due to the very low iron content in the crystal. In most tourmalines, iron strongly influences the hue toward greens or darker tones. In Canary tourmalines, however, its absence allows manganese to completely dominate the stone’s optical appearance. This unusual chemical composition makes Canary tourmalines some of the most intensely colored yellow tourmalines known in gemology. The finest specimens come from the Lundazi district in eastern Zambia, where boron- and manganese-rich pegmatites have allowed these unique crystals to form.
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