gemstone

Bicolored tourmaline (likely watermelon-type elbaite)

Elbaite tourmaline, complex borosilicate: Na(Li,Al)3Al6(BO3)3Si6O18(O,OH)4

AI-generated identification · may be incorrect

Small transparent, faceted or naturally fractured crystal showing purple-pink and golden-yellow zoning, with vitreous luster. Tourmaline has Mohs hardness 7–7.5, trigonal crystals, and indistinct cleavage; the yellow appearance may be enhanced by lighting or surface treatment.

Identified September 8, 2026More gemstone →

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Physical properties

Formation & geological history

Forms in lithium-rich granitic pegmatites through late-stage hydrothermal crystallization, commonly during the Precambrian to Mesozoic. The reported region of Minas Gerais, Brazil, is globally renowned for gem-bearing pegmatites and is a plausible source.

Uses & applications

Used as a collectible mineral and gemstone; fine transparent material is faceted for jewelry. Small included or damaged pieces generally have modest value.

Geological facts

Strong pleochroism and color zoning are characteristic; heating can alter some tourmaline colors. The image alone cannot distinguish natural zoning from dyed or coated material.

Field identification & locations

Confirm with loupe examination, refractive index, and specific gravity; tourmaline commonly shows lengthwise striations and an elongated crystal habit. Estimated value: $5–$50 for a small commercial specimen, $50–$300+ if natural, transparent, untreated, and attractively zoned.