A pair of ametrine, 20.75 carats

Technical details: Type: Ametrine Weight: 20.75 carats Dimensions (mm): 12.17x11.56x9.44 (average) Shape: Emerald Color: Bicolor Clarity: Eye-clean Transparency: Transparent Hardness: 7.0 Treatment: Untreated Origin: Africa Certification: Certificate from Saudi Laboratory (MT) - Website (www.mtgl.com.sa) Ametrine is a unique type of quartz mineral characterized by natural bicolor gradations that combine the purple color of Amethyst and the yellow or orange color of Citrine in a single crystal. This color variation results from differences in iron oxidation states inside the crystal and temperature variations during geological formation. Ametrine is relatively rare and is commercially mainly extracted from the Anahi mine in Bolivia.