I'm trying to remember the name of a sci-fi show (it may have been a movie) in which they were trying to recolonize earth. They had discovered a drug that gave people eternal youth but it reacted badly with some DNA and created these monsters. The crew trying to recolonized also had to be branded with these colored stones on their chest that were red, green, and blue. And they were only allowed to mate with people who had the same color. I don't remember much more except that there was a guy on the show that was branded with a black stone because he was part monster and part human. And he had a friend who had several clones. Any ideas?

It took me a long time to dredge this one up. You are thinking of the 1994 TV movie Island City. A plot summary from someone else who was looking for this: "I saw this color movie in the 90's on television in the US. It takes place sometime in the future where a drug was created that can stop the aging process. The problem is that it only worked for certain humans. Other humans were mutated by the drug and forced to live in the barren wastelands outside of the city. Something memorable of note is that before starting a relationship, each person must check wether a jewel, located on their hands I believe, matches in color to the other person's jewel. This is to prevent further mutants from being born. One of the main characters was a half mutant whose jewel color is black which is unique. Another of the main characters has a husband who did not take the drug for fear of becoming a mutant and is now an old man. The plot involves a group of forever young people going outside of the city to look for non-mutants. They find a woman who ends up being the long lost sister of someone in the city and bring her back."