mother of pearl ?

 I have been trying to find out if this is mother of pearl earrings. 

they are clip earrings

i have attemped to get photo's that are close up so you can see the pattern of the markings on the "pearl" . To me it appears to be lines, not bloches.

I have read that is one way to tell the difference.  The teeth test- i just dont get that one. The coolness to the touch test- not helping me either.

but as far as the "diamonds" in the center, they look to be real via the light test i read about (looking for the colors to show under light) , no colors showed.

thanks to any help you can give.