Purple gold...
www.Gold.org has the techie bits and you may find more practical notes from a jeweler who works with the alloy (
Click HERE).

I have never seen purple gold and pearls combined... but it could be nice. Since the alloy is so difficult to work, stone setting isn't obvious either - most design are modernistic, heavy, and play on variations of gold colors rather then matching with color-coordinated stones (although that sounds like an obvious idea, doesn't it!).
Since setting pearls is less metalsmithing-intensive, purple pearls could fit the bill.... Interesting

(OK. maybe not the outrageous one above - other purples, there's no shortage)
Just keep in mind that the metal will have to be carved and turned - not worked into common jewelry shapes.
Some of those
'cherry' pearls 'round here are well worth some style innvation, methinks
