How are Candy Crush's candies made?

Hi,

I'm wondering how the sprites from Candy Crush are made.

Here is a picture: https://www.spriters-resource.com/resources/sheets/52/55525.png

Did the artists create a 3D model of each candy, apply a specular shader and then rendered it and made a 2D sprite out of it?

Or did they simply use Photoshop to create a shiny effect?
If they did use Photoshop, how can I recreate a round & shiny effect like that?

Thanks!