Suggest an Edit Name* Categories* Clothing store Convenience store Department store Electronics store Furniture store Hardware store Home goods store Jewelry store Liquor store Pet store Shopping mall Supermarket Add category State* Locality* ZIP* Street address* Phone* Website Opening hours Company description Your comments (not for publishing) * — Required information Washington Gem & Mineral Co ← View details 640 East Diamond Avenue # B, Gaithersburg, MD 20877 +1 301-963-0200