Our Titanium Gemstone Cabochon Stud Earrings feature a variety of beautiful gemstone cabochons in different sizes and colors and patterns. Our Titanium bezels are made from Grade 23 Titanium, made up of 90% Titanium, 6% Aluminum, and 4% Vanadium. This is the grade of Titanium commonly used surgically in the medical field for Titanium left in the body (for example joint replacements, surgical staples, bone fixation devices, and orthopedic pins, screws and cables). This Titanium is hypoallergenic and is nickel free. These post earrings come with Commercially Pure Grade 1 Titanium ear nut earring backs.