About the variety Variegata/Variegated which I was one of the first to grow and to offer seeds for it.
http://tatianastomatobase.com/wiki/Variegated
Everything you showed in your pictures is normal for this variety and yes, the varigation can be seen on the stems and yes, also at the stem end of fruits as well. And yes, doesmuch better withshade since when it gets hot out the variegation just disappears and comes back in the Fall when the temps are cooler,
I grew it many times for seed production for my SSE listings and also offered it in some seed offers in the past.
So I know it very well and IMO it has nothing to do with the blue effect. To be honest when I was growing it starting back in 2004 there weren't all the blue varieties we have today.
And all the years I was growing it I never grew anything that had the blue antho effect.
Interesting variety, yes, but as for the red fruits it produced, not one I suggest for the taste of those fruits and quite a few grow it just as an ornamental.
Carolyn