Are these Tahitian Pearls or FWP?

[Pearl's Haven]

A customer sold these to my brother for his jewelry store, but I can't tell if they are Tahitian or FWP. They do not appear to be dyed
They're near-round and have pink, green, blue and purple luster/hues.

 

[jshepherd]

These are dyed freshwater pearls.

 

[De Blancas]

Dyed Freshwater Pearls. the purple luster looks unnatural, authentic tahitian pearl purple luster does not look like that

 

[Pearl Dreams]

Chinese FW, dyed, no question. The color is way off for Tahitians.