Tiffany Case is a fictional character in the James Bond novel and film Diamonds Are Forever. For the 1971 film she was portrayed by Jill St. John. In the film it is stated that she was named after her (accidental) birthplace, Tiffany & Co., where her parents were going through a choice of wedding bands, to which Bond dryly jokes that she was lucky that it hadn't happened at Van Cleef & Arpels.
In Ian Fleming's novel, she is an American diamond smuggler working as a fence for "The Spangled Mob," a ruthless American gang that is smuggling diamonds from Africa through an international pipeline. Bond contacts her in London using the identity of petty crook Peter Franks, using her professionally as a gateway into the pipeline even as he develops a personal interest in her. Felix Leiter, familiar with Tiffany's background, acquaints Bond with the fact that she was gang-raped as a teenager and, as a result, has developed a hatred of men. She is nevertheless attracted to Bond, and the two ultimately become lovers.
After this adventure, the two briefly live together, but, like many of Bond's women, she is out of his life by the next novel, From Russia With Love. Fleming explains her departure therein. He explains that Bond, by his own admission, is difficult to live with in a domestic setting, and that Tiffany returned to the United States with an American military officer, apparently intending to marry him. The explanation was somewhat unusual both because Fleming rarely even mentions Bond girls for more than one book and because Bond actually seemed emotionally affected at the dissolution of a relationship.
In the novel, in the scene where Tiffany is introduced, several Bond girls are mentioned, including two that had not yet appeared. When Bond is speculating what "T. Case" stands for, two names that come to mind are Tilly and Teresa. Both names would later be used for Bond girls, Tilly Masterton and Teresa de Vicenzo.
The 1971 film adaptation of Diamonds are Forever substantially revised the plot and, with it, Tiffany's character. In the novel Tiffany is a vulnerable young woman with a sardonic exterior and an experience of the world beyond her years, similar in many ways to female characters in noir fiction. The cinematic Tiffany, however, while often wise-cracking, is also somewhat ditzy, slightly naive, and more money-grubbing. While she is still a diamond smuggler, she is now unwittingly working for Bond's archnemesis Ernst Stavro Blofeld and his terrorist organization, SPECTRE. Bond arranges a partnership with her in disguise, but this time it is to investigate her role in Blofeld's latest criminal scheme. She initially believes that she and "Franks" are going to make millions, but gets caught up in much more than she bargained for when the real Peter Franks arrives on her doorstep. From the moment she and Bond find Plenty O'Toole soaking in Tiffany's swimming pool, drowned mistakenly instead of her, Tiffany helps Bond follow the path of the smuggled diamonds until the trail leads to Blofeld.
By the end of the film, Tiffany has helped Bond defeat Blofeld, and the two go on a romantic cruise together. They are briefly interrupted by an assassination attempt by Blofeld's henchmen, Mr. Wint & Mr. Kidd, but Bond foils it, and the two sail off into the sunset.