Gemstone: Natural Diaspore Weight: 18.96 ct Shape: Cushion Cut: Modified Brilliant Transparency Optical Phenomenon: ColorChange Treatment: None Certificate: ICA GemLab (International Colored Gemstone Association) The gemstone originates from Turkey and has been certified by ICA GemLab in Thailand. Report Number: 177943 Dimensions: 16.96 x 14.49 x 9.94 mm Additional Information Large natural diaspore weighing 18.96 carats, featuring the characteristic color-change phenomenon: Yellow-green under daylight Pinkish-orange under incandescent/tungsten light (The stone shows natural inclusions typical for untreated Diaspore. Photos taken under strong light to show details.) Certified by ICA GemLab as natural and untreated, using FTIR and microscopic analysis Cut in a Modified Brilliant Cushion style, with an elevated profile and an appealing play of light. Comes from a private collection and includes the original ICA GemLab certificate. A suitable piece for collectors, gemstone enthusiasts, or high-quality custom jewelry Shipping is carried out from Spain, securely packaged and fully tracked.