South sea or larger baroque Akoya?

@Gloriahahaja, you can learn more about pearls in the many articles right here on Pearl-Guide, and also I recommend the PearlsAsOne course (you can take it free with a code), and also I recommend Renee Newman's excellent book, Pearl Buying Guide, 6th edition, available on Amazon.
There is a lot to know about pearls! They are more weird and wonderful than most people know!
Per the pink and silver undertones, I believe you're referring to the body color. This same body color can be found in other types of pearls and doesn't necessarily indicate the pearls are South Sea. It's quite common in freshwater pearls too.

What you're seeing with the akoya is a thin-film interference effect. The light reflects from the surface of the pearl, and penetrates and reflects from inner layers. This overlapping strengthens and weakens the light waves, which creates the colorful optical illusion (orient) you often see in akoya pearls with good nacre. It's similar to what happens with soap bubbles when light reflects from the front and back surfaces, interfering with each other.

View attachment 463788
the D----C is the orient?