Gem, ndiye zotsatira zabwino za chilengedwe, ndipo ndife onyamula katundu wa gem.D&T Trading Co., Ltd. tapatsidwa mwayi wopereka chitsimikiziro chokongola chachilengedwechi kwa onse okonda kukongola.
D&T ndi amodzi mwa opanga zazikulu, zamakono komanso akatswiri ku Wuzhou, omwe ali ndi zaka zopitilira 20 zopanga, akuyang'ana kwambiri miyala yamtengo wapatali yopitilira 30 monga ruby, safiro, ndi tsavorite.D&T makamaka kutumiza kumayiko opitilira 100 monga India, Thailand, United States, Poland, ndi Switzerland, ndipo anapambana mbiri yabwino, Monga Integrated mwala wamtengo wapatali malonda ku zipangizo kuti pro-kupanga, malonda ndi misonkhano.