I am sure that it takes a variety of factors (known and unknown) to make a great hot pink round. I can do my best, but some pinks are hot and some are not. This is one of those hot ones. This standard round brilliant has a little scatter toward the girdle, that is irrelevant to its beauty, but I don’t think that cleanliness is a significant factor in hotness. I also know that manganese +3 can be solely responsible for red in some tourmaline and I hope to use my spectrometer and other testing to see what is hidden in the tourmaline that might go beyond just being red. I have read about and seen indications of absorption of visible light, right at the boundary of the infrared. It could either be copper or manganese +3, but the real question I have is why Mn+3 sometimes produces this increased absorption of light and at other times it does not. I don’t have an answer, but I have seen a relationship between the perceived brightness of a hot pink tourmaline and the absorption at the far red end of the spectrum by probably Mn+3, in the collection. I am working to get a better view of the complete spectrum for those hot tourmaline that show the increased absorption. The posted stone weighs 2.10 carats.