The Utility Electronic Precious Gemstone Type And Quality Detector (Utility Gem Tester) is a simple, portable, rugged and dependable hand held device that identifies gemstones and rates a gemstone's quality using an internal tabulation of the gemstone's wide spectral response to ultra violet irradiation. The device contains a low power UV LED and a multichannel photodiode array for a wide band spectral analysis of a gemstone's response to the impinging UV laser beam. The spectral analysis is then compared with the internal tabulation of spectral fingerprints of known gemstones and an analysis is visually displayed. The Utility Gem Tester is intended to fill the needs of amateur (gemstone) rock hunters and jewelry kiosk personnel in identifying the various marketable precious stones.