Kite diamonds themselves cannot be resized or altered easily due to their specific geometric shape and cut. Any attempt to alter the shape of a kite diamond would likely affect its symmetry, proportions, and overall appearance, potentially damaging the stone or reducing its value.
However, if you’re referring to resizing the jewelry setting that holds the kite diamond (such as a ring), the resizing process is usually possible, depending on the metal and design of the band.