Write a review Your name* Your e-mail* (Not for publication) Rating ★★★★★ Excellent ★★★★☆ Very good ★★★☆☆ Average ★★☆☆☆ Poor ★☆☆☆☆ Terrible Your review * * — Required information Mineral & Gem Society of Castro Valley ← View details 20948 Corsair Boulevard, Hayward, CA 94545 +1 510-887-9007