Joseph Kilpatrick, at Honeywell Avionics led the team which developed the ring laser gyroscope.

Tungsten rings can be engraved with a special laser engraver. Do not use a standard one as it will look bad and just ding up the ring. Expect to pay $25 - $50 for a laser engraving.

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Yes the laser engrave on tungsten ring should be a light grey color . The laser won't damage the ring surface and after laser engraved, rings will still with a smooth face.

Most tungsten jewelry supplier charge the laser engrave but some of them are not like tocoy.

Gyroscope is a mechanical or optical device used to maintain orientation during motion.

A mechanical gyroscope consists of a rapidly spinning wheel set in a framework that permits it to tilt freely in any direction or to rotate about any axis. The momentum of such a wheel causes it to retain its attitude when the framework is tilted. An optical gyroscope, laser or fibre, measures the interference pattern generated by two light beams, traveling in opposite directions within a mirrored ring or fibre loop, in order to detect very small changes in motion. Gyroscopes are used in compasses, in automatic pilots on ships and aircraft, in the steering mechanisms of torpedoes, in antiroll equipment on large ships, and in inertial guidance systems.

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