A cikin kasuwar agogon yau, akwai nau'ikan kayan da aka yi amfani da su don lu'ulu'u na agogo, kowannensu yana da halaye na musamman waɗanda ke tasiri kai tsaye ga aikin agogon, ƙayatarwa, da ƙimar gabaɗaya. Kallon lu'ulu'u yawanci suna faɗi cikin manyan rukunai uku: gilashin sapphire, ma'adinai ...
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