A push button clasp opens when deliberate pressure depresses the spring-loaded release, freeing the locking gate or barrel without requiring a tool or a fingernail.
Stone Story
Star sapphire produces a six-rayed star that moves across the surface under direct light. It's not a coating or treatment. It comes from rutile needles aligned inside the crystal structure along three axes, so the effect you're seeing is entirely the stone. Cabochon cutting is what allows it to show.
Industry Insight
A single latch clasp does not overcomplicate the assignment. One tab, tongue, or lever meets one catch point, and the necklace or bracelet is closed cleanly.