ISBNs beginnend mit 978-3-9523867-x-x Contributions to Gemology No. 13Record-breaking rubies discovered in Didy, MadagascarAdolf PerettiGRS Gemresearch Swisslab AGSoftcover2013 Contributions to Gemology No. 14Identification of a New Generation of Synthetic CVD-grown Blue Ping and Yellow DiamondsAdolf PerettiGRS Gemresearch Swisslab AGHardcover2014 Pigeon Blood ValleyOn the Trail of Mogok's Famed Burmese RubyAdolf PerettiGRS Gemresearch Swisslab AGBuch2016 Pigeon Blood ValleyOn the Trail of Mogok's Famed Burmese RubyAdolf PerettiGRS Gemresearch Swisslab AGBuch2016
