Pearl pendent?

[Boop]

Would this pendent be cultured or naturally formed?

 

[Pearl Dreams]

That's a blister pearl. I'm guessing cultured, due to the roundness of the bead.

 

[pearlescence]

It's possibly one of the very earliest of the bead nucleated experiments - there was a sudden deluge of strands of these on the market about ten years ago - http://www.pearlescence.co.uk/index.php/cPath/93_26_52_54 (A few strands left)
Def not natural (although prob natural colours ie not dyed or otherwise treated)