Do some natural diamonds phosphoresce or just synthetic diamonds (hpht)?
I had a small diamond with phosphorescence. I but rough and after it was cut. I read book that explain this diamond is rare. But, in the market this kind of stone doesn’t have hi price. I think is because is not comom and few people know.
In the first line when you read but, read bought.
type IIB diamonds glow in the dark for a short time. This afterglow refers to the phosphorescence of a diamond which ranges in colour from blue to pink and fiery red, depending on the diamond.
hope this helps.