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The Breaking Point was a weapon created by Bismuth to give the Crystal Gems an advantage against the Homeworld Army. Steven destroys the weapon in lava at the Forge after poofing Bismuth in her eponymous episode.
The Breaking Point is a weapon very similar to a pile bunker. It has a maroon colored base, an amaranth colored Bismuth emblem, two little black straps underneath for the arm, a silver cylinder on one end, and a large metal spike on the other.
It functions by drawing back the knob on one end and then when fired, the spike on the other end darts out a short distance and smashes anything directly in front of it. Bismuth claims that it can shatter any Gem, even a Diamond.
Some time during the Rebellion, Bismuth desired to make a powerful and revolutionary weapon to combat the Crystal Gems' disadvantage against Homeworld. Upon completion, she asked Rose for her opinion on it. Rose was opposed to using the weapon, claiming that it was not right to shatter Gems. Bismuth was unable to accept her refusal, and Rose was ultimately forced to poof and bubble away Bismuth to prevent her from using the Breaking Point.
Once introduced to Steven, Bismuth presents the weapon to him as well, but he also rejects it in the same manner as his mother. This infuriates Bismuth, who attempts to shatter Steven with the weapon. However, Steven defends himself by turning Rose's Sword on her, stabbing her through the midriff and thus poofing her. After this, Steven throws the Breaking point into the lava in the Forge.
After learning that his mother had shattered Pink Diamond, Steven had assumed she had used the Breaking Point to do it. When on trial on Homeworld and pressed by Blue Diamond for explanation on how the shattering had happened, Steven gives a fictitious account of the final confrontation between Rose and Pink Diamond, ending with the assumption that the former used the Breaking Point much to Blue's rage as she knew this was a lie due to eyewitness accounts saying Pink Diamond had been shattered with Rose's sword.
In preparation for Ruby and Sapphire's wedding, Steven unbubbles Bismuth and reveals to her the recent discovery that Rose Quartz had secretly been Pink Diamond the entire time, secretly leading the Rebellion against her fellow Diamonds. Bismuth is blown away by not only the revelation itself but the entirely new light it cast on their disagreement, as she had unwittingly shown Rose a weapon intended to use on her alter ego. Bismuth also laments that in the end, Rose did "[take her] advice" in a sense, in that she "shattered Pink Diamond" - i.e., faked her own shattering.
- As a result of Steven's mentioning it in "The Trial", the Great Diamond Authority are now aware of the Breaking Point's existence and that the Crystal Gems have access to such a weapon (as its destruction was not mentioned), though they may have discounted it as a fabrication made up by Steven.
- The Shattering Robonoids of Homeworld are also capable of shattering gems, though they use beams of energy while the Breaking Point uses pure physical force, an indication of the advances in technology Homeworld has made since the Rebellion.