Here's a Wall Street Journal review of several online object appraisal services. I happened upon it while looking up textile appraisers. Feel free to share any thoughts or experiences you might have about using either these or other object/art appraisers.
http://www.wsj.com/articles/SB10001424052748703447004575450170902767324
http://www.wsj.com/articles/SB10001424052748703447004575450170902767324