Dr Stern,
The Chau/Chav/Chow system is very common in the Natural Pearl trade for centuries.
This is the calculation..... carat X carat X 88 divided by 135 equals to 1 pearl chau/chav/chow.
Best
Amyn
Did the pearls come in as natural.
I am doing the similar led light test and compare other pearls i have to the GIA natural saltwater pearls and see the same yellowish color you see in your beautiful pearls.
Just wanted to take your expertise on the photo done with bright light behind and the natural pearls look yellowish.Is that an easy way to find out natural versus cultivated pearls.
I am doing the similar tests with a 208 lumen led light and come to the same conclusions as its the same yellowish...