Afghan two-tone tourmaline stone, 2.63 carats

Technical details: Type: Bi-Color Tourmaline Weight: 2.633 carats Dimensions (mm): 25.45x4.04x2.09 Shape: Freeform Color: Bi-Color Clarity: Eye-clean Transparency: Transparent Hardness: 7.0-7.5 Treatment: Untreated Origin: Afghanistan Certification: Laboratory certificate (MT) Saudi - Website (www.mtgl.com.sa) Bi-color Tourmaline is a distinctive type of Tourmaline, characterized by the presence of two or more different colors clearly within the same stone. This unique phenomenon results from changes in the chemical composition of the minerals or environmental conditions (such as temperature and pressure) during crystal growth. The colors usually appear in specific areas or zones within the stone, where one color transitions to another sharply or gradually. These colors can be any combination of the multiple colors found in Tourmaline, such as pink and green, blue and yellow, or even a mix of three or more colors (known as multicolor Tourmaline). One of the most famous examples of bi-color Tourmaline is Watermelon Tourmaline, which features a red or pink core surrounded by a green outer layer resembling watermelon rind.