The size of these turquoise beads is 18mm. Chineese turquoise disc beads. Yes, these are stabalized. They are 100% natural in color and stabilized. In order to make turquoise hard enough to use for jewelry making purposes, it must be stabilized. This semi precious gemstone is said to be the stone of communication, helping those who have a fear of public speaking. In the same vein, turquoise is considered to be a stone of friendship, strengthening the bond between friends. These turquoise beads are very limited!!