Rose Quartz

Rose Quartz is the mother of Steven and former member of the Crystal Gems. According to Greg, she has given her physical form up in order to give birth to Steven, while passing her gem onto Steven as well. Rose's appearance also seems to be carved into the mountain in which the Gem temple resides in.

Appearance
Rose was a Crystal Gem with long, curly, pink hair and a white leotard with a star-shaped cutout in the stomach area and pink lipstick. In "Together Breakfast", her portrait revealed that she had a gem on her belly, much like her son.

Steven Universe
Steven Universe is the son of Rose Quartz. Rose gave up her existence to bring Steven into the world while in a romantic relationship with Greg Universe (Steven's father).

Steven doesn't seem to know much about his mother apart from what the members of the Crystal Gems and his father, Greg Universe have told him.

Members of the Crystal Gems
Rose Quartz was previously a member of the Crystal Gems before she brought Steven into existence. The group seems to hold her in high esteem. Amethyst is quoted as saying "If Rose were here, this would be so easy" in the episode Laser Light Cannon. The members of the group seem to mourn her passing, but even though she gave up her existence to bring Steven into the world, they do not blame it on him and live with him in the temple.

Greg Universe
Greg Universe was the husband\boyfriend of Rose Quartz until she brought Steven into the world. Greg and Rose seemed to have had a very good relationship and we don't know anything about their relationship apart from what Greg has said about it. Greg said that the two of them met at one of his one-man band concerts in Beach City, where she was the only attendee. The two then never left each other's side after that. Greg said in the episode Laser Light Cannon: "I don't know what a magical lady like that ever saw in a plain old dope like me..."

Trivia

 * In gem stone mythos, rose quartzes are stones associated with love and health.
 * In the episode "Laser Light Cannon", the light that came out of the cannon resembled her.
 * Rose has not been seen with her eyes open.
 * A possible reason she was in love with Greg was because of the song he made for her, "Let me Drive my Van into your Heart".