Write a review Your name* Your e-mail* (Not for publication) Rating ★★★★★ Excellent ★★★★☆ Very good ★★★☆☆ Average ★★☆☆☆ Poor ★☆☆☆☆ Terrible Your review * * — Required information Washington Gem & Mineral Co ← View details 640 East Diamond Avenue # B, Gaithersburg, MD 20877 +1 301-963-0200