In short
- Check identity first: natural emerald, not synthetic or another beryl.
- Read the treatment line closely: type of filler and degree.
- Origin is an opinion of the laboratory, not a guarantee.
- Match weight and measurements to the stone, and verify the report number.
1. Identification
The report first states what the stone is, for example natural emerald. Watch for wording such as synthetic, green beryl or assembled stone. Some laboratories call lighter stones green beryl rather than emerald, which affects value.
2. Weight, measurements and shape
The carat weight, dimensions in millimetres and the shape and cut are recorded. Compare them with the stone in front of you. A mismatch in weight or measurements means the report may not belong to that stone.
3. Treatment (clarity enhancement)
This is the line that matters most for value. Laboratories usually state whether fissures contain a filler, what kind (oil or resin, sometimes both), and the degree. Common terms are none, insignificant, minor, moderate and significant. Wording differs between laboratories, so read their definitions.
Note that oil can partly dry out or be removed over time, and stones can be re-oiled. A report describes the stone at the moment of testing.
4. Origin
Some laboratories give an origin opinion, for example Afghanistan (Panjshir), Colombia or Zambia. It is based on inclusions, trace elements and spectroscopy, and is an expert opinion. Not every laboratory offers it, and not every stone can be assigned an origin.
5. Comments, photos and date
Read the comments section: it can mention durability concerns or other remarks. Check the photo on the report against the stone and look at the date. An old report may not reflect later treatment.
6. Verify the report
Many laboratories offer online verification by report number. Use it. If a seller is unwilling to share the full report before purchase, treat that as a warning.
How Kohvand uses lab reports
On every emerald listing we show the laboratory, report number and date where a report exists, and we write the treatment exactly as the report states it. Read more on our Origin & Transparency page, see what sets the price of an emerald, or browse our Panjshir emeralds.
