Stun Spots, a wandering pony with a ring on his horn and spots on his hooves. traveled all over the lands of Equestria.
He decides to settle into a small town named Ponyville to setup shop and start selling masks. There, he will meet many colorful ponies, six in particular that he will soon consider to be his best friends, and a Princess with a mane so colorful and a coat that shines so bright, he may or may not develop a crush on.

His ring is shining so bright with pink brilliance. What is causing this phenomanon?