Ridged, not plain.
The compact Edge octagon with grooved stripes running around it, so the light breaks into fine lines. It's 14.5mm across and clips on with no piercing. Sold as a single ear cuff, so pair it with polished or pavé Edge pieces.
Wear it with: Wear it with the matching Edge Small Stripe Earring, or add sparkle with the Edge Small Diamond Earring.