A trapiche ruby is a rare type of ruby (corundum) known for its unique, spoke-like, six-rayed star pattern, resembling a cogwheel, which comes from its specific growth conditions with impurities like calcite or rutile forming distinct radial zones. Primarily found in Myanmar (Mogok) and India, these collector's gems feature transparent ruby sectors separated by darker, opaque planes, creating a striking visual, with Burmese stones prized for rich color and Indian ones sometimes larger with purple hues, but they are typically small and delicate.