I wasn't sure if this size would work for Soom Petit Gem, but it fits perfectly! The eye white size is 10mm, but eye iris is 6mm (like a 12mm iris). It gives a gorgeous dreamy look to my deer doll. I got these, and a few other pairs of eyes, on sale. Sale eyes are just as perfect quality as non-sale eyes, and sell very quickly. It is necessary to check Swandoll's site often, and their youtube releases, for new eyes.