I don't have any topaz - but I've got plenty of citrine I also found a very nice round garnet wire wrap pendant that I'm planning on having turned into a stick pin. As to emerald and ruby ... I can't seem to find good quality stones on eBay. My uncle was a jewler and I inherited his wife's emerald pendant. It's flawless and has such an intense green fire that almost everything else I see doesn't even compare.
I bought some bulk rough peridot that I need to tumble and have drilled ... it should make a really nice necklace. I just need to decide who to give it to for a birthday/christmas gift
I just looked on Caplan Duval for your pattern ... looks like they don't carry it - but give them a call (they have a toll free number) - they might have some stock, or at least point you to another source. Replacements.Com has a few pieces listed, although I usually find their prices a tad high. Just remember eBay isn't always the best bargain