Material: 925 sterling silver Centre stone: Natural aquamarine, 4 carats, 8 mm × 10 mm This item includes the exquisite jewellery box shown in the photograph. The oval-shaped centre stone weighs approximately 4 carats and is sky blue in colour; the gemstone is natural and untreated. Shipping: We deliver via UPS, Royal Mail, DPD, and other logistics providers. Delivery times depend on your local postal system, but most orders within Europe arrive within 5 to 7 business days.