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The Breaking Point was a weapon created by Bismuth to give the Crystal Gems an advantage against the Homeworld Army. It was thrown into lava (and presumably destroyed) after Steven defeated Bismuth at the Forge.
The Breaking Point is a weapon very similar to a pile bunker. It has a maroon colored base, a salmon 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 and smashes anything directly in front of it, including gemstones. Bismuth claims that it can shatter any Gem, even a Diamond.
Some time during the Rebellion, Bismuth desired to make a more powerful and revolutionary weapon to combat their disadvantage against Homeworld. Upon completion, she eventually asked Rose for her opinion on it, to which she turned down, claiming that it was not right to completely shatter a Gem, and that being shattered is something that nobody deserves.
Once introduced to Steven, she presented the weapon to him as well, but he also rejected it in the same manner as his mother.
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 gave 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 a sword.