That's what I was told that lower great platinum's although they have markings as they grow the markings will slowly fade. In my experience I purchased the high grade Platinum that had extremely glowing white but bad eyes very froggy but it didn't live long enough for me to know how it would turn out but there was absolutely not one spot of black on it had nothing to do with lighting no tricks this came from a very top importer Personal Collection. I hope get another one from him his next import and give it one last try.