Tahitian on white baroque & round.

Tahitian baroque pearls and white baroque on semi round Freshwater pearls from China.

In Tahiti it is illegal to import pearls from anywhere else, so you don't see colors mixed.
In China and Japan, the black pearls are all dyed.
So it is unusual to find Tahitian pearls mixed with others - - but - -
In Jane's World, anything goes!  That's why I call this a "Naughty Necklace"