What does PD stamped on the inside of my ring?

tearing out cabints on a remodle i found a gorgeous ring it is marked PD on the inside....help i believe its called a micropave halo or a grand cirque ring.
Its made out of the metal Palladium. "Pd"
Most jewellers mark jewellery with their initials or a distinct and unique mark, especially when it is made out of a precious metal such as gold, silver or platinum, in order to distinguish their jewellery from others. This could be the reason. Hope this helped (:
i think it means Palladium but not to sure.
Tag: What does PD stamped on the inside of my ring?