Threaded Post Earrings Platinum. Each platinum stud has a .10 Points Diamond, perfect for all ages. These prong set earrings feature a classic 1/5ctw round brilliant cut diamond (F+ color, SI 2-3 clarity) in 20 gauge for comfort with 18k white gold threaded covered backing and platinum open backing, they ensure secure, gentle wear for babies, kids, and adults. Pierced by professionals trusted since 1987. Note: exact stone and setting may vary slightly.