shape
Round is the most difficult shape to culture, making it the rarest ciltured pearl shape.
The closer is it to the round shape, the more valuable is it. Though, there are some exceptions that makes pear, oval, or baroque
(irregularly shape) are also beautiful and loved by pearl lovers.
size
When other factors are equal, larger pearls are rarer and move valuable than smaller pearls.
The big size is harder to be produced and found year to year and could shows the more precious and attracts most people’s eyes on it.
Bigger size also could show or reflects more value is the pearl, while the other factors are equal.
