The Best Camp for the Gems you need for all the chest pieces of Velious armor is in Sirens Grotto. Have someone succor you to the far side (near WW zone) Invis, and head to the well. Swim all the way to the bottom of the well and turn right - when you come out of the water there will be many sirens around you. Setup your camp on the left side of the stairs if you are looking at them from the front, This is a relative safe spot.
The sirens are almost all enchanters, which mean they dispell, charm, mezz, fear, all sorts of fun. They Only drop the Chest piece gems, ie Pristine Emeralds, Flawless Diamonds, and some other junk like conch shell horns, and other shell pieces. The camp is great and you can get all you need within about 15 mins.
I got a torn enchanted silk robe in Kael yesterday also while soloing in the Arena, it was the only drop I got yesterday, but I did get Plate Legs and Leather boots on a prior trip.
Hope this helps
Babbatomebe 70 Druid - MorellThule