Shop › Czech Glass Sea Shells with Swarovski Crystals and Sterling Silver Image 1 of 1 Czech Glass Sea Shells with Swarovski Crystals and Sterling Silver $50.00 sold out The Osterville Earring features real Czech Glass, Swarovski Crystals, and Sterling Silver. Sold Out Added! The Osterville Earring features real Czech Glass, Swarovski Crystals, and Sterling Silver.