Product Details. Hoop Thickness: 2.5mm. Hoop Diameter: 15mm. Sturdy snap closure.. Gem sizes: 2.5mm to 3.5mm. Diamond size: 2mm. Safe for sensitive skin.. 14K Gold PDV Stainless Steel. Build Your Own:. Click the Build Your Earrings button.. Select your hoops.. Select your charms.. Add as many charms as you'd like! One for daughters, sons, loved ones, etc.. Click the Add to Cart button once you're done picking your charms.. Proceed to checkout, or keep browsing the rest of the site!. Plus.... Some months have more than one stone, so pick the one you like most. Each charm comes with a card inscribed with the meaning of the stone, and everything comes together in a beautiful jewelry pouch, ready for gift giving!