I got my pearls from a trip to Davao, but I do go to greenhills everytime I go to Manila, and not just for pearls. Now though, I do notice that they have increased their prices, so getting my pearls in Davao was a treat for me! I still hope that the pearls I got were from there and not from China.
Anyways, when is your trip? Nowadays, I notice their prices have increased because foreign buyers now go there so they feel they can up their price. Can't blame them! I do notice though that when you go in the afternoon, or evening, they will be willing to go cheaper because they're tired and would just want to make a sale. South Seas or Freshwaters, I really wouldn't care, because they're just gorgeous. Are you a Filipino or do you speak the language? It would be great if you have a local to be able to help you haggle.
I get a lot of freshwaters there for personal use. Some earings are as cheap as a dollar, so that's what I use when I go to the beach to feel feminine without having to worry about them falling off and me losing big bucks!
There are real South Seas there too which they sell loose. A pair for earrings would go for about $100. These are the ones that look really smooth (ok, I am not a pearl expert... just a pearl lover) and round. I know these sell in the thousands already retail. Or at least a few hundred bucks more.
Another place to go in Greenhills... Bangus Restaurant!! They have great Milk fish recipes, then go over to Goodies and Sweets for some Chocolate Decadence cake