10mm. We just love some nice mookite over here and know you will really appreciate these highly polished faceted round beads too. So here is the skinny on Mookite gemstones...Mookite is a type of jasper, with varying shades of cream, yellow, gold, brown, red or burgundy,and other colors. This stone is mined in Western Australia as well as China. Mookite’s healing properties include relieving depression and fear as well as healing wounds and maintaining a healthy thyroid gland.