Approximately 20mm _________ We recommend the product care instructions below to make your jewelry last even longer. Product Care: -Apply beauty products such as perfume, hairspray or deodorant before wearing your jewelry as certain chemicals in these products may damage the finish. Always remove your jewelry before swimming, bathing, doing household chores or using abrasive cleaners. - Fast Shipping - orders ship in 1-2 business days - Satisfaction Guarantee, Returns Accepted - Please ask for larger quantities if would like more than what is currently listed! - For international customers: Import duties, taxes, and charges are not included in the item price or shipping cost. These charges are the buyer's responsibility. You can check with your country's customs office to determine what these additional costs will be.