Mr. Miguel Carlos Zenetos Expert Appraiser of Precious Stones and Jewelry PJB registration nº25010/21 Training: Graduated from the Gubelin Academy Level 1-2-3 Switzerland Graduate Gemologist (GIA-1981) Professional activity: With 44 years of experience in analyzing and evaluating colored gems, rough and cut diamonds and also jewelry. 55 61 999488613
Mr.George William Fernandes Coelho B Businessman Petra Precious Stones (Ruby, Emerald, gold, Import and export) PETRA USA LLC, PETRA MINERAL GUINEA, GWC INTERNACIONAL BUSINESS.
