US: 8mm Snug Hoop to United Kingdom Size 16G Piercing Standard

US: 8mm Snug Hoop: Features a post thickness of 1 $\text{mm}$ (0.0394 $\text{in}$), hoop inner diameter of 8 $\text{mm}$, gemstone carat equivalence of N/A (Hoop), and earring style Hoop / Lobe-Hugging.

United Kingdom Size 16G Piercing Standard: Features a post thickness of 1.2 $\text{mm}$ (0.0472 $\text{in}$), hoop inner diameter of 0 $\text{mm}$, gemstone carat equivalence of 1.50 ct+ / Bold, and earring style Stud / Cartilage.