Any not only gemologist but experienced dealer needs just a brief look to say if a stone natural or synthetic or diffused. Synthetic resins/polymers are easily recognized. 1.45 ct Natural Zambian Emerald Certified" is in sale since Monday, September 17, 2018.This item is in the category "Jewelry & Watches\Loose Diamonds & Gemstones\Loose Gemstones\Emerald\Natural Emeralds". The seller is "antonowsky" and is located in Bernhards Bay, New York. This item can be shipped worldwide.