See the scan of the GIA appraisal in the images for a full description.
The ring seems to be either a 5, 5.5 or 6 in size, we've attached pictures of the ring on a size chart.
It was appraised on Jan 27, 2008 at $20,000 CAD which was equivalent to $19,924.29 USD on that day (USD and CAD were almost on par at the time, 1.0038 CAD for every USD).
This was a gift to my wife from her mother around 2005. It was purchased during a trip to the United States and then taken back to Canada where it was appraised.
It has never been worn, just stored in the bank safe deposit box. It is in perfect, new condition.