High-quality natural Swiss Blue Topaz octagon-shaped faceted-cut gemstones calibrated to 15x20 mm (approx. 24.50 to 25.50 cts per stone). Sourced from top-grade natural topaz rough and treated via standard, stable irradiation to achieve a vibrant electric blue color, these gems are precision-cut in our own factory by skilled artisans. They feature classic emerald/octagon step-faceting for high brilliance, eye-clean clarity, and fine surface polishing. Ideal for statement solitaire rings, bold pendant centers, statement dangles, and custom fine fashion jewelry designs. Wholesale bulk quantities and custom orders available upon request.