I do not believe this mob drop the Darkened White Gold necklace, I believe this is a drop from the a froglok noble.
After killing this mob multiple times the loot i have had from him are the Darkened Mithril Frog Totem like mentionned above and the Shimmering Darkened Shroud. http://lucy.allakhazam.com/item.html?id=41341
Edited, Jul 20th 2008 10:27am by DevanaFlamme