Pearl Bracelet. What is this supposed to show?

[A Breaker]

It seems very important, but I am trying to understand what they are showing... anyone help me?

 

[Pearl Dreams]

Looks like akoyas (looking at overtones).

 

[A Breaker]

Is that what it is trying to show me...overtones? I don't understand why? Is that verifying they are akoyas?

 

[BWeaves]

I don't know what they're trying to show you, either.

 

[StarryPearl]

Why say it seems very important?

 

[A Breaker]

Well...I don't feel so ignorant. Hopefully someone in the pearl trade knows.

 

[LorenLL]

Pearl Science Laboratory use the same setup (black background with diffused white light at the bottom) as a standardised way to observe the aurora effect a.k.a. interference colours. The strength and colour pattern of aurora effect is believed to be correlated with nacre quality and lustre, and it is one of the criteria for a pearl to be certified as hanadama. Source

The "aurora effect image" gives you some idea on the colour and the richness of the overtone in normal situations. Basically, the colour of the overtone IRL is the opposite of the colour shown in the bottom half (illuminated by white light), and the more vibrant the aurora is, the more visible the overtone becomes even when observed under other lightings.

As for the pearl strand in your post, it looks like the aurora is pretty weak, with a few pearls showing a slightly stronger green and/or pink tint, which means the strand would mostly be in a uniform white/light pink colour.

 

[A Breaker]

Wow! That really does tell a lot about the pearls! Thank you so much LorenLL!!! So people can more accurately tell the color & matching (assuming I remember how that works)...It also helps me spot the roundness more easily. I am still laughing about the photo...if I needed an expert's help...how much does it really tell the average buyer???