Ko te whetoko tapa kaha he taputapu whetohia matua e hangaia ana hei mahi i ngā tauira maha o te wehenga tāngai me te whakapai ake i te mata i runga i tētahi taputapu anake, ka mutu ai te hiahia ki te whakauru i ngā whetoko maha noa. Ko tana hoahoa e whai ana i ngā āhuatanga whetohia rerekē ki ngā wāhanga rerekē, e āwhina ana i te whetoko kia neke mai i te whetohia pōpō ki te whetohia māmā. Ko te tikanga, kei te whetoko he raupapa o ngā rahi o ngā paraihe: ko ngā paraihe pōpō (36-80) ki tētahi wāhanga mō te wehenga nui, ko ngā paraihe waenganui (120-240) ki te wāhi waenganui mō te whakapai ake, me ngā paraihe iti (400-800) ki tētahi atu wāhanga mō te tuku i te mata. Ko tēnei āhua whānui e pai ana mō ngā whakamahinga e hiahiatia ana ngā whakapai ake maha, pērā i te hanga metara, te whanaketanga i ngā wāhanga motukui, me te whanaketanga taputapu me ngā toa. Ko ngā paraihe whetohia e whakamahia ana – ina heke ki te whiti karu, zirconia alumina, te karu kirihou rānei – ka whiriwhiria kia rite ki te matāpuna matua, me ngā paraihe u ki ngā metara, me ngā paraihe ngoikera ake mō ngā matāpuna ngoikera pērā i ngā hiwitai. Ko te kai hono, ina heke ki te taraukawa, he taraukawa rānei, kua whakaritea kia pakari tāwhai i ngā wāhanga katoa, ka tūtona te mahi i te rohe whetohia. Ko te hanganga o te whetoko pea he ara kīato mō te rewharewha, e whakapai ake ana i te raweke tru tāpoi te hau teka. I te hanga metara, ka taea e ia te wehe i ngā rāranga tinana, whakamaru i ngā tapa, me te whakapai ake i ngā mata i te kotahi, ka heke tere ai i te wātaka tukatuka. Hei tauira, i te whanaketanga o ngā rotā whakamutunga motukui, ka whakamāmātia e ia te neke mai i te tahumaero kauta ki te mata tāpiripiri tika. I te hanga whare, ka whakamāmātia e ia te whetohia i te konukenuke, e takotoria ana i te whakatinanatanga me te whakapai ake i ngā āhua hanga. Ko te painga matua o te whetoko tapa kaha ko tana āhua whakatenatena i te tika o te āhua i ngā tauira katoa, nā te āhua ōrite o te whetoko e āki ai te whakapungawhenua o te taonga e kitea ai ina hurihia nga taputapu. Mā te whakakotahi i ngā mahi maha ki tētahi anake, ka piki ake te hinga, ka heke te utu tupeka, me te whakapono hua ōrite, ka nui te aki i ngā horopaki umanga nui me ngā horopaki whanaketanga tika.