Chicago Gem Lab is more of what I think of in terms of a traditional appraiser; knowledgeable gemologist sitting down with a client and going over the ins and outs of a piece. She'll look at both loose items and set items. Lorraine has appraised several peices for me over the years and she produces a very detailed thorough report, including a photo of the item and a plot of the inclusions of the diamonds.
Pro Gem is more of a "technical/scientific" operation. Lots of equipment and deep analysis going on there. I have never personally used Pro Gem, but they are very well respected. I would probably go there if I wanted a Sarin or some other more in-depth analysis.
But depending on what my need was, I wouldn't hesitate to use either one of these organizations.
I second this comment. I recently had a ring appraised by Lorraine and thought she was very thorough. She was also flexible with her schedule to fit me in.Date: 3/30/2008 4:29:37 PM
Author: Dee*Jay
Chicago Gem Lab
5 South Wabash, 16th Floor
312-263-2221
Lorraine Oakes is great to work with!