- Apr 25, 2014
If you study a few shells you can see all the colours. They are in there genetically. For eg, some white South Sea shells show a real pink touch. Pink SS pearls are out there but very unusual.
As to why molluscs have such colour when they are down in the dark, don't have eyes and don't need pretty colours to pull a mate...I've never seen an evolutionarily sound explanation.
And thank goodness for that! (responding to Douglas' comment...not sure why that didn't quote properly)
Wendy, very interesting topic. Thank you for posting that GIA link. I had a conversation with a pearl dealer a few years ago in Tucson about this very subject. Her speculation was that the purples were treated in some way.