Product Description
This is a 400-carat lot of natural rough emerald from Afghanistan, classified as facet grade. The stone is genuine and untreated — no enhancements or modifications have been applied to its natural state.
Key Specifications
- Stone: Emerald (Natural Green Beryl)
- Origin: Afghanistan
- Total Weight: 400 Carats
- Clarity: VVS to VS
- Colour: Vivid Green to Green (with light green zones)
- Crystal System: Hexagonal
- Treatment: No Treatment (Untreated)
About This Emerald Rough
Emerald is a variety of beryl, coloured by trace amounts of chromium and vanadium. This lot originates from Afghanistan, a recognised source of emerald deposits in the Panjshir Valley region. Afghan emeralds are known in the gem trade for their natural green colour and relatively low treatment rates compared to stones from other origins.
The rough is classified as facet grade, meaning the material has sufficient transparency and structural integrity to be cut into faceted gemstones. The clarity range of VVS to VS indicates that visible inclusions are minimal to slight — typical for emerald, which is a Type III clarity gemstone under GIA standards. The hexagonal crystal structure is natural and unmodified.
The colour profile spans vivid green to green, with some lighter green zones visible in the rough. No treatment has been applied — the stone remains in its natural state as extracted.
Suitability
- Lapidary artists cutting faceted emeralds from rough
- Jewellery designers sourcing custom-cut emerald material
- Wholesale gem buyers and traders
- Collectors of natural, untreated rough specimens
Sourcing & Shipping
All gemstones from Gemstone Insider are responsibly sourced and shipped worldwide with fully insured, secure packaging.
Frequently Asked Questions
What does "facet grade" mean for rough emeralds?
Facet grade indicates the rough has enough transparency and clarity to be cut into faceted gemstones. Not all rough emerald meets this standard — lower-grade material is typically used for cabochons or carvings.
How can I verify this rough emerald is genuine?
Genuine emerald can be confirmed through gemological testing — refractive index (1.577–1.583), specific gravity (2.67–2.78), and characteristic inclusions. A lab certificate from GIA, Gübelin, or AGL provides third-party verification.
What does "no treatment" mean for emeralds?
No treatment means the emerald has not been oiled, fracture-filled, heated, or chemically enhanced. Most emeralds on the market are oiled to improve clarity, making untreated specimens comparatively rare and valued.