Many PGers here have bought from Pearl Paradise and are happy customers. I'm one of them and I would not hesitate to buy from Jeremy again and again. In fact I have quite a few orders lined up because of the trust involved. With PP you never have to worry about the quality - what you see is what you get, as stated in the description.
Buying on ebay can be difficult - even if the feedback is 100% positive it can be hard to know about the quality - not many people can appraise pearls accurately, especially for consumers. We are all highly attuned on this forum, but that is not the case with the general public. I have had a look at the Australian website (
http://www.pacificpearls.com.au/) - although it seems reputable they do have a number of low quality pearls as well. It's a good thing that they rate those as A quality, but the pictures are not as big as I'd like to assess the quality of the larger pearls. In general, I think the workmanship is not as good as Pearl Paradise just from what I've seen. They also do not state that the black freshwaters are dyed.
I personally find the yellow gold a tad out of fashion with the diamonds looking like headlights. I just prefer white gold.
In terms of value for money, the Australian website may be cheaper being closer to the source, but I'm not certain Pacific Pearls (two PPs, how confusing) is actually a true wholesaler. You can only get good prices in quantity. It doesn't matter where you are purchasing from if you're the vendor. The pearl vendors in Australia sell at normal retail prices possibly higher than in the US. The size would only matter if the quality is as stated and both pearls are graded using the same criteria. It may seem so on paper, but there is universal grading system and no guarantee of the quality. I would buy from Jeremy as I do not personally believe anyone can beat his pricing at that quality given the quantities he buys in. Jeremy would also know most of the wholesalers and farming enterprises in Australia, so perhaps he can comment on Pacific Pearls.
Ultimately it's up to you. You might decide to try ebay and let us know if the quality of the pearl is as stated. You might be pleasantly surprised. I wouldn't take the risk. You may "save" a few hundred bucks, but given that you're already shelling out a large sum of money for a pair of earrings I'd play it safe.