Navel Bar. Titanium Rainbow Double Gem Navel Bar (Belly Bar). 1.6mm gauge. Available in 6mm - 14mm lengths. Supplied with two gem balls, 5mm gem ball top, 8mm gem ball bottom. Available in a choice of gem colours. This Navel Bar is made from highly polished Coloured (anodised) Surgical Titanium and sparkling CZ (cubic zirconia) gems. Titanium is suitable for people with metal allergies. High quality Navel Bar.