Species :Natural Quartz Shape and cut : Oval Modified Brilliant Weight : 12.89 Carats Measurements : 18.12x14.48x8.31mm Color : Yellowish Green Certificate no : M3C66538 Transparency : Transparent Characteristics ：Natural Characteristics Declaration: Country of Origin is an opinion offered by the seller of this item. This opinion is not substantiated by an official laboratory. Thank you. Ship by Hong Kong post air mail trackable M3C66538 Pay attention: Gemstones are commonly treated to enhance colour or clarity. This has not been researched for this specific item - Each screen displays colors differently. Therefore the colors on your screen may differ from reality. - The photos of the ring have been greatly enlarged and illuminated to obtain a clear view