sparkle2 [uncountable and countable]
a bright shiny appearance, with small points of flashing light:
the sparkle of the diamonds
a quality that makes something or someone seem interesting and full of life:
the sparkle and zest of a live performance
if someone has a sparkle in their eyes, their eyes seem to shine, and you can see a feeling in them, especially happiness or excitement:
There was a sparkle of fun in her brown eyes.