Patent ID: 8749253

Claim:
A gem tester for testing a gem under test, the gem tester comprising: an elongated body having a first end and a second end; a probe extending from the first end of the elongated body; a first circuit portion located within the elongated body, the first circuit portion being electrically coupled to the probe to measure electrical conductivity of the gem under test; a second circuit portion located within the elongated body, the second circuit portion being thermally coupled to the probe to measure thermal conductivity of the gem under test; a third circuit portion located within the elongated body communicatively with the first and second circuit portions, the third circuit portion configured to determine identified type and drive a color control signal in response thereto, the identified type being selected from a plurality of gem types; a luminescent mounting extending from the first end communicatively with the third circuit portion, the luminescent mounting providing a plurality of colors corresponding to the plurality of gem types, the luminescent mounting lighting one of the plurality of colors in response to receiving the color control signal; and a line-of-sight contour extending from the second end of the elongated body to the first end of the body, including the luminescent mounting to the probe.