This 14kt solid yellow gold nose screw features a 1.5mm real diamond. The diamond has PK2 clarity, color G-H. The 20g nose screw has an inner diameter of 6mm. The diamond set is so that it actually lays flat on your nose, it won't stick up and out like most others on the market. Measurement: Gauge: 20g (0.8mm), Diamond clarity: pk2, fits perfectly in a 20g or 18g nose piercing, Inner Diameter: 1/4" (6mm), Diamond Size: 1.5mm.