Ko ngā mana whakahaere matua mō ngā whakamātautau ā-rohe ko te NGTC (National Gemstone Testing Center) me te GIC (China University of Geosciences). Ko ngā mana whakahaere o te ao ko te GIA (Gemological Institute of America), GRS (GemResearch Swisslab), me te SSEF (Swiss Gemmological Institute). Mō ngā whakapaipai utu nui, whiriwhiria he mana whakahaere o te ao; mō ngā taonga noa, he rawaka tētahi o te kāinga.
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