If your House Insurance includes contents then most definitely! (Make sure it covers things like Jewellery) An Appraisal Certificate will include a description of the piece, a photograph and the replacement value - the important information when making an insurance claim. If your pieces are particularly valuable it may be wise to have them individually insured. Talk to your Insurance Broker.
Appraisals are available through us, Gems by Jael, and usually take a day or two to be processed.