14Kt Yellow Gold Threadless Pronged Round Opal/CZ Trinity Top is made of solid 14kt nickel-free Gold with durable 316LVM ASTM F-138 Implant Grade Steel Pin designed to be practical and easy to use. Fits all sizes of pins and bases in our threadless body jewelry line. Gem Size: 2mm; Pin Size: 0.45mm x 4.7mm.