I have bought this pre-owned pendant in white gold with diamonds and pearl. It's freshwater or south sea? I don't think it is akoya because I have several of those and they are not like this one. The second photo it's next to what I think it is an akoya, the third it's next to what I think it is a freshwater oval and the fourth it's of the mark stamp. It is originally from a reputable jeweler here. What do you guys think? Thank you.