a housing; and

a testing circuit, housed in said housing, comprising:

a power source supplying electric power to said testing circuit;

an optical system which comprises at least one UVA/UVC optical sensor and a quartz light guide column having at least one portion extended out of said housing;

a UVA/UVC LED unit comprising a UVA/UVC module which comprises a substrate, a UVA LED chip, a UVC LED chip and a partition member, wherein said substrate is electrically connected to said constant drive via an electrical wiring, wherein said UVA LED chip and said UVC LED chip are arranged in a side by side manner to face said optical system so as to ensure a UVA LED light, in a wavelength range of 320 nm to 400 nm, emitted from said UVA LED chip and a UVC LED light, in a wavelength range of 200 nm to 280 nm, emitted from said UVC LED chip being directed and focused to a stone being tested, and that reflections of the UVA LED light and the UVC LED light after penetrating the stone being tested are guided and focused by the quartz light guide column back to the at least one UVA/UVC optical sensor, wherein said partition member is made of a UVC blocking material and arranged between said UVA LED chip and said UVC LED chip, such that said UVC LED light emitted from said UVC LED chip is blocked by said partition member from irradiating said UVA LED chip of said UVA LED lamp;

a heating system; and

a thermal conductive tube, made of thermal conductive material and configured to be heated by said heating system, having at least one portion extended out of said housing in such a manner that said quartz light guide column is arranged and extended in said thermal conductive tube to form a tester probe unit, so that by placing a testing end of said quartz light guide column close to the stone being tested, while said UVA LED light emitted from said UVA LED lamp and said UVC LED light emitted from said UVC LED lamp are directed and focused onto the stone being tested through said quartz light guide column, said thermal conductive tube, encircling said quartz light guide column, applies heat generated from said heating system to the stone being tested at the same time; and

a central control unit, which is electrically connected with said power source, said optical system, said UVA/UVC LED unit, said heating system, and said thermal conductive tube and configured to coordinate said UVA/UVA LED unit and said heating system for managing inputs, outputs and operations of said precious stone testing apparatus and providing test results.