Wow! Some of the variations are tough to see! The "diamond sparkle" could be anywhere! On helmets, hands, wrists, belt buckles, a dotted "i" on uniforms; those rascals are elusive! I searched through my large stack of cards, and low and behold I found one! You have to look REALLY closely to see it. I included a standard card on the right for comparison.
I couldn't find another one on eBay, so I think I can make a mint!
You can click on the image to enlarge. ( No Bip :)
It is amazing where they put those "jewels"!