Supersonic

Supersonic is a jewelry store featured in Grand Theft Auto V.

Description
Supersonic is a store on Atlee Street in Mission Row, the store is not accessible to the player and does not play any part in the story. Due to their tagline marketing themself as "ring specialists" its very likely Supersonic is a jewelry store probably selling gold rings. Their logo can be seen as a sponsor on one of the racing suits in Grand Theft Auto Online.

According to the storefront windows the store is closing down.

Trivia

 * Their name is a reference to the popular video game character Sonic the Hedgehog. Their tagline mentions "Ultra fast ring specialist" which makes the connection stronger due to Sonic being very fast and collecting rings in his games.