Sapphire Stagg meets and falls in love with one of Stagg's former employees, Rex Mason, and remains with him when he began adventuring as the super-hero Metamorpho.^[2] Simon Stagg greatly disapproves of Sapphire's devotion to Mason and schemes to break them apart (usually by putting Metamorpho into harm's way).^[3] Sapphire and Rex eventually marry and have a son together named Joey. Joey inherits the transmutative properties of his father, but can use these abilities to affect the chemical properties of other objects as well.^[4]

For a time, Sapphire believes that Metamorpho has died, and her father arranges for her to marry his Neanderthal assistant named Java.^[5] Although she remains loyal to Java, her heart always belongs to Rex. Eventually, Sapphire discovers that Metamorpho is alive and working in Paris as a member of Justice League Europe. The two have since reunited.

Birds of Prey edit

Java comes upon Black Canary while searching for help for Sapphire. His story is that Sapphire and Joey, Metamorpho's son, has been caught in a lab explosion and merged into a single energy being who was taking revenge upon Simon Stagg's former colleagues.^[6] It is revealed that not only were Sapphire and Joey merged, but so was Simon. It is he who is directing the revenge. Black Canary realizes that Java is actually Metamorpho, somehow affected to believe he is Java. The three are separated once more; Simon claims to have been overcome by the energy itself and unable to control his actions. As the comic ends, he steps away from the joyous family reunion to check on a growing clone of Java.^[7]

The New 52 edit

In 2011, "The New 52" rebooted the DC universe. Sapphire Stagg's history and her love for Rex Mason is the same.^[8]

DC Rebirth edit

In 2016, DC Comics implemented another relaunch called "DC Rebirth", which restored its continuity to a form much as it was prior to the New 52. Sapphire was present when Simon Stagg had opened a portal to the Dark Multiverse and is trying to close it with Metamorpho who was transmuted to Nth Metal.^[9] She is present when Mister Terrific, Plastic Man, Metamorpho, and Phantom Girl return from the Dark Multiverse.^[10] Metamorpho and Sapphire later discuss the strains on their relationship.^[11]

During the "Endless Winter" storyline, Sapphire Stagg is revealed to have a brother named Sebastian.^[12]

Sapphire Stagg appears in the Elseworlds story The Nail.^[13]

Sapphire Stagg appears in the Justice League episode "Metamorphosis", voiced by Danica McKellar. This version served as the catalyst for Rex Mason's transformation into Metamorpho, as Simon Stagg wanted him out of her life and subsequently made him a test subject for his Metamorpho project, which was originally meant to help workers survive hostile conditions. However, this fails as Sapphire still loves Rex after his transformation.

Sapphire Stagg appears in Beware the Batman, voiced by Emmanuelle Chriqui. Like in Justice League, Simon Stagg transformed Rex Mason into Metamorpho in an attempt to stop his relationship with her.^[14] In the episode "Monsters", Sapphire, seeking to impress her father, provides thugs with armor and weapons to drive people out of Old Gotham and buy the territory for profit. Batman suspected Simon Stagg to be the culprit, but later learned of Sapphire's involvement and stopped her.