Inter auctoritates domesticas probationum praecipuas numerantur NGTC (Centrum Nationale Probationum Gemmarum) et GIC (Universitas Geoscientiarum Sinensis). Auctoritates internationales includunt GIA (Institutum Gemmologicum Americae), GRS (GemResearch Swisslab), et SSEF (Institutum Gemmologicum Helveticum). Pro ornamentis pretiosis, auctoritatem internationalem elige; pro ornamentis ordinariis, domestica sufficit.
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