{"product_id":"natural-swiss-blue-topaz-165ct-step-cut-brazil","title":"16.5 Ct Natural Swiss Blue Topaz | Step Cut | VVS–Eye Clean | Heated | Brazil","description":"\u003ch2\u003eNatural Swiss Blue Topaz – 16.5 Carats\u003c\/h2\u003e\n\n\u003cp\u003eThis listing offers a single loose Swiss Blue Topaz weighing 16.5 carats, cut in a rectangular step cut. The stone measures 16×11×10mm and displays a medium aqua-blue color with strong clarity through its step-cut facets. Origin is Brazil, and the stone has been heat-treated — a standard and stable industry process used to produce the Swiss blue color from colorless or pale natural topaz.\u003c\/p\u003e\n\n\u003ch3\u003eStone Details\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eStone Name:\u003c\/strong\u003e Topaz – Swiss Blue\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTotal Weight:\u003c\/strong\u003e 16.5 carats\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCarat Range:\u003c\/strong\u003e 1–20 carats (filter range)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 16 × 11 × 10 mm\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCut \/ Shape:\u003c\/strong\u003e Step Cut (Rectangular)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e Aqua Blue (Swiss Blue)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eClarity:\u003c\/strong\u003e VVS – Eye Clean\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTreatment:\u003c\/strong\u003e Heated\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOrigin:\u003c\/strong\u003e Brazil\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDeal Type:\u003c\/strong\u003e Single Stone\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eStone Type:\u003c\/strong\u003e Loose \/ Unmounted\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eGem Classification:\u003c\/strong\u003e Semi-Precious Stone\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBirthstone:\u003c\/strong\u003e November\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eIntended Use:\u003c\/strong\u003e Jewelry \/ Ornament Setting\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eAbout Swiss Blue Topaz\u003c\/h3\u003e\n\u003cp\u003eSwiss Blue is a specific color grade within the blue topaz category, distinguished by its medium-intensity aqua tone — lighter than London Blue but deeper than Sky Blue. The color is produced through a combination of irradiation and heat treatment applied to natural colorless or pale topaz from Brazil. This treatment is permanent and industry-standard. The step cut used here emphasizes the stone’s transparency and depth of color by reflecting light through its large flat table and parallel facets.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat is the difference between Swiss Blue, Sky Blue, and London Blue topaz?\u003c\/strong\u003e\u003cbr\u003e\nSky Blue is the lightest shade, Swiss Blue is a medium vivid aqua, and London Blue is the darkest and most saturated. The difference comes from the intensity of treatment applied during production.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eIs heat-treated topaz less valuable than untreated topaz?\u003c\/strong\u003e\u003cbr\u003e\nHeat treatment is the accepted standard for all blue topaz on the market — natural blue topaz is extremely rare. Treated stones are stable, widely used in fine jewelry, and priced based on size, cut quality, and clarity.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat jewelry settings work best for a large step-cut topaz?\u003c\/strong\u003e\u003cbr\u003e\nStep-cut stones pair well with bezel and four-prong settings that expose the stone’s table. For a 16×11mm size, a cocktail ring, pendant, or brooch setting is most practical.\u003c\/p\u003e","brand":"Gemstone Insider","offers":[{"title":"Default Title","offer_id":52944226910519,"sku":"TOP-100","price":250.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0876\/6668\/8311\/files\/WhatsAppImage2026-09-02at15.05.30_2adfdd3f-bfbc-4028-ae29-9c1d76cc5ac1.jpg?v=1788438079","url":"https:\/\/www.gemstoneinsider.com\/products\/natural-swiss-blue-topaz-165ct-step-cut-brazil","provider":"Gemstone Insider","version":"1.0","type":"link"}