Help me understand the difference please

[WaltC]

Is there anything different between these? It looks like they are all using the same pictures but the price and even the size are different from each other. The one directly from Tahitian should be the best value but the size is the smallest. Thank you pearl experts.

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[WaltC]

My images aren't appearing. Maybe I am doing something wrong?

 

[WaltC]

 

[WaltC]

Also this one. The pictures all look like the same.