Kyakkyawan barbashi yumbu, wanda kuma aka sani da tarin yumbura. Ana iya bambanta shi da abubuwa biyar masu zuwa:
1. Dubi launi, launi iri ɗaya ne, babu bambance-bambance, babu fari.
2. Dubi haske, da haske ne high, da barbashi yanke surface mai sheki ne mai kyau.
3. Dubi gefuna da sasanninta, wurin da aka yanke yana da gefuna masu kaifi da sasanninta, kuma ba ya yin kwaya.
4. Dubi abin da ke cikin ash, barbashi masu kyau, ƙarancin tokar abun ciki.
5. Idan aka kalli taurin, ya kai ma'aunin taurin kasa na Mohs 7, kuma yana da juriya ga birgima.
Bayan an shimfiɗa shi a ko'ina a kan shimfidar wuri mai kyau, tarin yumbu mai kyau zai kasance mai kyau da kyau, tare da launi iri ɗaya, babu raguwa, da ƙarfin ƙarfi.
