You can find a gem or mineral or fossil sold or appraised at JCK in Las Vegas. JCK is a comprehensive collection point for jewelry in the United States of America. At this collection point, you can be able to meet and network with a number of appraisers.
Since you are in Las Vegas then I would think there would be Gem and Mineral shows coming to town often. Try one of those. I have never been so I dont know of any stores but I use shows and conventions to appraise my gems and minerals.