The Kashmir fingerprint is a healed-fissure inclusion pattern characteristic of sapphire from the Kashmir Sumjam locality in Indian-administered Jammu and Kashmir. Healed fissures are a near-universal feature of natural corundum and form when an early fracture in the growing crystal heals through later mineral deposition, leaving a planar array of fluid- and mineral-filled cavities that resembles a fingerprint or grid of small inclusions. The Kashmir variant is distinguished by the specific morphology of the fluid inclusions within the healed plane and by the trace-element environment in which the healing occurred.

For laboratory origin attribution the Kashmir fingerprint is one of several diagnostic features used in combination with trace-element fingerprinting, the milky silk pattern characteristic of Kashmir material, and the velvety appearance produced by light scattering off short rutile silk needles. Major laboratories including SSEF and Gübelin reference healed fissure morphology in their Kashmir-attribution reasoning.

For the working trade the term is most useful as a piece of vocabulary for understanding the inclusion-based reasoning behind a Kashmir laboratory call, rather than as a feature the dealer would identify independently at the loupe.