Mini Jam Tart Biscuit Stud Earrings £3.95 Out of stock. Mini Jam Tart Biscuit Stud Earrings. Choose from white, green, pink, black, orange and red. Made from polymer clay. Size: 8mm. Silver plated, also available in sterling silver. Please note: Sizes and shapes will vary with these types of products. Nickel free. One supplied.