I have just about every BEL or super form and would say the whitest are my super lesser or pastel lesser Mojaves. They all vary even within the same combo but I'd say if you go for a lesser Mojave you'll have the best luck. The problem is many gain the yellow striping with age so if you buy a baby there's no guarantee it'll stay as bright. Definitely avoid white diamonds or super Mojaves if you aren't familiar with how much their color changes.
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