Shop › ‘Opal moon’ earrings Image 1 of 1 ‘Opal moon’ earrings $17.00 These Japanese Opal studs are available in sterling silver or gold. Non-tarnish, water resistant, lead and brass free. Material: Select Material Gold Silver Quantity: Add To Cart Added! These Japanese Opal studs are available in sterling silver or gold. Non-tarnish, water resistant, lead and brass free.