One of the cuff link sets is done with dyed blue agates the other set is done with unbelievable natural tiger eye. Pictures never do the items justice. The stones are beautiful. I have done my best to match up the stones when I set them to have as closely matched pairs as possible. They are 20mm round. Very nice. The gems are cut with a flat back and actually set in rather deep on the settings. I am very happy with how they turned out. Very beautiful stones. You are always welcome to contact me as well. Happy to do custom orders. ----.-- Stop in and visit our e-store for many more great choices. Will gladly give shipping discounts and or ship internationally.---------If you add us to your favorites list you will be updated by e-bay when we list new items. Don't forget to sign up for our monthly news letter !