Diamond: Sweet romances where most of the heat is kept behind closed doors. These are stories for readers who want to read about the emotional aspects of romance, rather than the physical.
	Emerald: Moderate sensuality where love scenes are acceptable, but the heat level is still relatively mild. Clinical terms for genitalia and no graphic euphemisms.
	Sapphire: Standard sensuality level for most mainstream romances. Love scenes can be hotter and occur more frequently.
	Garnet: Hot, spicy romances featuring detailed love scenes, graphic description of body parts, and intercourse. Garnet novels are considered erotic romance, but they do not feature subject matter that is typically controversial.
	Fire Opal:  The hottest of the hot, these novels feature intense, erotic scenes including, but not limited to, ménage, BDSM, and same-sex partners. Intimate scenes account for a larger portion of the novel, and sexual elements often dominate the plots.