My childhood pony days were more or less over in 1988. I remember when the princess ponies came and thought they looked a bit weird because they didn't have a proper symbol, I never got one. I don't think I ever saw a twinkle eyed pony in the store and the BNG princesses came out after I had quit playing with ponies. What I'm trying to say is that I've never seen these ponies mint. I now own one TE, two princess ponies (Royal Blue and Sparkle) and two BNG princess ponies (Skylark and Brilliant Bloom).
I can see the remains of the coating on the eye of the TE pony and I know that they're supposed to have it but there's also some remains on Princess Sparkle's symbol and I think there's some on Princess Brilliant Bloom's gem on her forehead. There's absolutely nothing on Princess Royal Blue as well as on Skylark.
Question: Did the gems on the princess ponies, both the first kind and the BNG ones, have shimmering coating?