This midnight dark blue solid TITANIUM 6ALV-ELI (Grade 23) IMPLANT GRADE belly button ring comes with a matching blue cubic zirconia jewel. The bottom bead size is 10mm and top bead size is 6mm. This belly ring is 14 gauge and measures 10mm-3/8 inches. Titanium navel rings are lightweight, corrosion resistant, and less likely to react with bodily fluids! For extra safety your titanium body jewelry can be sterilized in an autoclave.