Natural Black Tourmaline Rough Nuggets Beads - Black Tourmaline Bead Stone Pendant 7.5 inch strand You have the option of selection a 7.5 inch strand or a 15 inch strand. The beads vary in size but range between 8x10mm to 15x18mm (varies) These are all natural and vary. Photos are representing items from lots. Colors can vary from lot to lot. Sizes can minimal vary too. Normally, It will took about 10-15 days delivery for United states,and 15-20 days for any other countries. For any reason, if you are not satisfied with our product, you may return your order within 14 days from the date of shipment received.