The iris is colored with pastels and glitter, and coated with resin. It's made with plaster and non-yellowing resin, so it will last a long time without discoloration. These are 12mm eyes with a 6mm iris. I haven't used any photography lights, but I've taken the photos in a bright room. Please note that the colors may not appear exactly as shown in the images depending on your viewing environment. There may be some dust or air bubbles. I try to be careful to avoid noticeable bubbles, but please refrain from purchasing if you are looking for perfection. I also sell 18mm, 16mm, and 14mm sizes, so please take a look if you're interested! *The price includes free shipping for doll items, so there are no discounts for multiple purchases. Cast Doll Doll doll bjd Resin