Certified Natural Swiss Blue Topaz – 21.88 ct – Octagonal Emerald Cut – ICA GemLab Presented by ParaibaCollective, this magnificent 21.88-carat Natural Swiss Blue Topaz showcases a captivating vibrant Swiss blue hue, complemented by refreshing ocean-blue reflections, beautiful transparency and attractive crystalline brilliance. Swiss Blue Topaz is admired for its radiant blue coloration, elegant appearance and timeless beauty. Its refreshing aquatic tones and impressive size make it an appealing choice for sophisticated jewelry creations and distinctive gemstone collections. Expertly fashioned into an elegant octagonal emerald cut, this gemstone features a beautifully elongated rectangular silhouette, precisely beveled corners and carefully arranged step facets that create striking geometric reflections and a captivating hall-of-mirrors effect. Its substantial carat weight, captivating blue appearance and refined architectural cutting make it an excellent choice for bespoke cocktail rings, luxury statement pendants, Art Deco-inspired jewelry and distinctive gemstone collections. Measuring nearly 20 mm in length, this impressive 21.88-carat specimen combines generous proportions, sophisticated cutting and captivating Swiss blue coloration. Gemstone: Natural Blue Topaz Species: Natural Topaz Weight: 21.88 ct Dimensions: 19.90 × 11.79 × 9.69 mm Color: Swiss Blue (Seller Description) Lab Color: Blue Shape: Octagonal Cut: Step / Step (Emerald Cut Style) Transparency: Transparent Certification: ICA GemLab Report No.: TH26G134925 Report Date: 29 October 2026 Treatment: The laboratory notes that blue topaz is commonly heated or irradiated to modify its color. The color-treatment history of this individual gemstone is undetermined. From Our Bangkok Cutting Facility At ParaibaCollective, our gemstones are selected by our in-house gemologist and precision-cut to highlight their natural beauty. ParaibaCollective — From Rough to Remarkable.