Vibrant blues and jewel tones, abstract designs with, from what we see, no two buttons alike. The base button is smooth, white, good quality Freshwater shell. Backs are also this coloration, and the intricate designs differ front to back. They seem painted. Not quite 5/8" diameter. Holes are about 2m. About 2mm thick. Sold per pack of 20 buttons. Unique and fabulous!