Demarco Castle was raised in Jeffrey Manor/ South C on Chicago’s tough South Side; after a chance meeting with Lupe Fiasco he was signed by Lupe Fiasco to his record company 1st and 15th Recordings, having been impressed by Castle’s rapping and singing skills. Originally known as Gemini, he later changed his name to GemStones for legal reasons. Much of his buzz came from writing and performing with Lupe Fiasco on his landmark albums Lupe Fiasco’s Food and Liquor and Lupe Fiasco’s The Cool, notable songs would be He Say She Say, Pressure, Just Might Be OK, and their dual rapping on The Die. With 1st and 15th now dissolved, GemStones has had a falling out with Lupe Fiasco and is unsigned. However, he managed to release one of the best and most underrated mixtapes of 2012 with Elephant In The Room

(Source: Rapgenius.com)