Reply to: Evidence for two blue (type IIb) diamond populations

Sturman N., Otter L.M., Homkrajae A., Manustrong A., Nilpetploy N., Lawanwong K., Kessrapong P., Jochum K.P., Stoll B., Götz H., Jacob D.E. (2019) A pearl identification challenge. Gems & Gemology, Vol. 55, No. 2, pp. 229-243.