Price listed is for 10 preset stones. These are Siam ruby acrylic faceted round rhinestones that are preset in gunmetal cinch mount settings. The stone has a faceted top and back, and measures about 10mm. The setting measures about 13mm by 11mm, including the loop at the top. The inside of the loop measures about 1.3mm. You should be able to open the setting and replace the stone should you want to. However, the settings were not meant to be opened and closed again and again, and doing so may result in damage to the setting.