Increasing the purpleness of beaded freshwater pearls

I'd welcome one red 11mm round, finally to complete Charlotta's rainbow necklace. Just one.
In refreshing my familiarity with the spectrum, red as a primary color requires the mollusk to come up with it on its own. Purple and gold would result in deep brown--a distinct marketing challenge, unless of course they were to be expressed as stripes...
 
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