Измеритель Твердости драгоценных камней инструменты

Hardness Pencil with Natural Material Stone and Exact Hardness : - Those minerals are mounted in five metal pole respectively,use the corner of those mineral to scratch the gemstone,you will get the hardness according to the nick you scratch,if there is a nick after you scratched,the sample's hardness is lower than the standard hardness pencil;if there is no nick after you scratched,that means the sample's hardness is higher than the standard hardness pencil.1.use the indirect-vision method to estimate the hardness of the sample. 2.find a inconspicuous place,use the talc-l or plaster-2 to scratch the sample,if can't do,that means the sample's hardness is higher than the standard hardness pencil,so use the higher pencil to scratch,repetitive operation. 3.when you scratch,don't too heave or too light,just proper vigor. 4.direct test method cost damage to the gem,so pl use it proper.generally speaking,we won't use this method to the finished gem.