Category: The Appraiser’s Notebook

Valuing a Crazed Opal

Although the assignment discussed here involves a cracked or crazed opal, the methodology is similar for any damaged gemstone. The appraiser only has what is in front of them, and if it is a damaged…

Duo Valuation of an Unusual Ruby

The use of pricing adjustments is relatively common, especially when the appraiser is using the cost approach. However, in assignments where the subject property falls outside of the core range of trading for that variety…

Lab Diamond Grading Differences

Lab grading differences are becoming a hot industry issue. The differences in grades from one lab to another are problematic. Consumers are being deceived into thinking that they are buying a diamond with higher grades…

How to Grade Clarity-Enhanced Diamonds

As more companies entered into this technology, known as fracture-filling, or clarity enhanced (CE), the door became wide-open for vendors to assign the clarity grade of their choosing. While we at Northwest Gemological Laboratory have…