The metal component of this ring is sterling silver (925), accompanied by an ALGT laboratory certificate. The main stone is a natural, untreated aquamarine weighing approximately 4 ct. This item also includes the exquisite leather jewellery box pictured 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.