Sterling silver, 22K and 24K gold.  Thick flat slices of the most incredable moonstone I have ever seen!  golden Blue greens flash all over the stone, with a purple blue stripe running down just off of center.  PLEASE NOTE: PLEASE LOOK AT ALL THE PHOTOS!  You will not see this flash from every angle in every light, just like any moonstone.  The least flash is in the photo with me holding the earrings.  Having said all that, these are really gorgeous!  2-3/8" long from the post.