The listing, Stunning Marked Sterling Silver Earrings with Dk Blue & Turquoise Stone has ended.
These are stamped TM-286 Mexico 925. I believe the stone in the center is authentic because I can see inclusions through a jewelers loupe, although I can not say 100%. So, I really don't know if it's authentic or not, and if it is, what stone it actually is. As stated in the title they are dark blue with a turquoise color. As you can see in the pictures, the stones, although the same, are different images. From where it connects to the hook is 1" long. These are very pretty, I'm just not the best photographer in the world! Good Luck!