21.28 ct Natural Amethyst – Purple Cushion Offered is an attractive 21.28 ct Natural Amethyst (Quartz) displaying a purple colour with transparent clarity. The gemstone is fashioned in a Cushion shape with a Brilliant / Modified Step cut, giving it an elegant and balanced appearance. Gemstone Details * Species: Natural Quartz * Variety: Amethyst * Weight: 21.28 cts * Colour: Purple * Transparency: Transparent * Shape: Cushion * Cut: Brilliant / Modified Step * Dimensions: 16.03 × 14.91 × 12.16 mm * Phenomena: None GemLab Report Details * Report No.: TH26G130244 * PIN: 5684 * Report Date: 11 September 2026 * Testing: Microscope, EDXRF, Raman, FTIR, UV/VIS/NIR, LA-ICP-MS Treatment See report comments. Amethyst is commonly heated or irradiated. According to the GemLab report, colour authenticity is currently undeterminable. A beautiful 21.28 ct Natural Amethyst featuring a purple colour, transparent clarity and an elegant cushion Brilliant / Modified Step cut, suitable for collectors and jewellery design.