Ear Stretching Crescent. Bone Crescent Stretcher. Available in gauges 2mm - 8mm (US 12g - 0g). Made from smooth, polished bone. Organic ear stretching crescents are breathable and comfortable to wear. For more info about Organic Body Jewellery please read our materials guide. For use in stretched piercings such as the Stretched Earlobe. For help with sizing please read our sizing guide. Unusual crescent earring for Ear Stretching.