Software for Gemstone Grading and Appraisal Valuation.Published in:Gems & Gemology, 2006, v. 42, n. 3, p. 130By:Drucker, Richard B.Publication type:Article
Social, Political, Economic, and Gemological Impacts on Pricing Trend.Published in:Gems & Gemology, 2006, v. 42, n. 3, p. 95By:Drucker, Richard B.Publication type:Article
OTHER RESOURCES.Published in:Journal of Gemmology, 2018, v. 36, n. 2, p. 89By:Drucker, Richard B.Publication type:Article
'World of Color' Communication System.Published in:Journal of Gemmology, 2014, v. 34, n. 3, p. 187Publication type:Article