We do have some orders in for that color (#20210), but we usually receive a color that is a bit closer to pale sapphire.
Apparently the color-change Czech glass is very pretty (that icy-pink-lavender-blue) in indoor light, but I've heard it gets grayish outdoor. I haven't personally seen this color-change though. I will try it out as soon as I can.
I think this is what your customer is looking for ... it is a bluish gray outdoors, and a purplish indoors. I'll see what shapes we have, that do this.
--Polly