Natural Bi-Color Unheated Tanzanite – 1.87 ct – ICA GemLab Presented by ParaibaCollective on Catawiki, this distinctive 1.87-carat Natural Tanzanite displays an unusual greenish-violet bi-color appearance, with contrasting tones giving the gemstone attractive natural character. Fashioned in a cushion shape with a Modified Brilliant cut, the transparent stone offers lively reflections and distinctive color zoning, making it an appealing collector’s Tanzanite. Gemstone: Natural Zoisite Variety: Tanzanite Weight: 1.87 ct Dimensions: 9.31 × 6.35 × 3.84 mm Color: Bi-Color Greenish Violet Shape: Cushion Cut: Modified Brilliant Transparency: Transparent Treatment: Unheated Laboratory: ICA GemLab Report No.: TH26G132431 Report Date: 5 October 2026 Unheated is seller-declared; the ICA report states that color authenticity is currently undeterminable.