Decoding 'PL' Markings on Rings: What Does It Mean?

Question
I WAS GIVEN A RING WITH A RATHER LARGE AMETHYST. I DO NOT BELIEVE IT IS WORTH MUCH, BUT I WOULD LIKE TO KNOW WHAT THE MARKING 'PL' INSIDE OF THE RING MEANS.

Answer
s gRAY,

I DON'T REMEMBER PUTTING MY INITIALS IN AN AMETHYST RING BUT I MAY HAVE. MY INITIALS BEING PL ALSO DON'T MEAN A DARN THING AS FAR AS I KNOW. MANY THINGS GET STAMPED OR MARKED IN JEWELRY THAT MEAN SOMTHING ONLY TO THE PERSON WHO STAMPS IT THERE. THE QUALITY STAMPS ARE WELL KNOW LIKE '14K', 'STERLING' ETC. SOME ARE DESIGNER STAMPED AND SOME ARE JUST MFG. STAMPS.

PETER