Jewelry appraisal help

My mom has asked me to have her jewelry appraised, including an antique watch, and then to sell it for her. I have absolutely no idea where to start! I am hoping someone might be able to tell me how to find a reputable person or business to help me this process. How do I know if a person or business is trustworthy - is there some sort of credential or certification I should be looking for? Any advice would be greatly appreciated. 

[Moderator Note] See past advice here: https://www.berkeleyparentsnetwork.org/questions/jewelry-appraisal

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RE:
Jewelry appraisal help (Jan 18, 2018)

I suggest Clars in Oakland. I haven't sold anything there. But I have had them look at a few things I was considering selling and their insight was helpful. I have purchased several things. It seems to be a very well-run business.