Product Description
This is 300-gram lot of facet grade rough Swiss Blue Topaz is sourced from Brazil. The stones have smooth-surfaced, chunky, and consistently blue throughout — making them straightforward to orient and cut with minimal waste. Clarity grades across the lot are VVS to Eye Clean, with good transparency visible even in raw form.
Stone Specifications
- Stone: Topaz (Swiss Blue)
- Total Weight: 300 Grams
- Grade: Facet Grade Rough
- Form: Loose Rough
- Colour: Swiss Blue — medium-to-vivid blue, between Sky Blue and London Blue
- Clarity: VVS / Eye Clean
- Treatment: Heated (standard industry practice for blue topaz colour)
- Origin: Brazil
- Hardness: 8 Mohs
What is about?
The lot has approximately 25–30 individual pieces. The colour is consistent across pieces, ranging from medium Swiss Blue to a slightly deeper vivid blue. No significant colour zoning is visible. Pieces vary in size, with most falling in the 8–15 gram range.
Suitable For
- Lapidary artists cutting custom faceted stones
- Jewellery designers sourcing calibrated or freeform cuts
- Gem collectors adding rough material to their inventory
- Wholesale buyers purchasing bulk facet rough
Frequently Asked Questions
Is Swiss Blue Topaz a natural stone?
Yes — Swiss Blue Topaz is natural topaz that has been heat-treated to produce its blue colour. This is the standard, industry-wide process for all blue topaz; untreated blue topaz in this shade does not occur naturally.
What carat yield can I expect from facet grade rough topaz?
Yield depends on piece shape, cleavage orientation, and cutting style.
How does Swiss Blue compare to Sky Blue and London Blue Topaz?
Swiss Blue sits between the two — lighter and brighter than London Blue, deeper and more saturated than Sky Blue. It is the most commonly used shade in commercial jewellery for its balance of visibility and versatility.