Stellate Zircon Inclusions in Vivid Purple-Pink Morganite
Zircon clusters and other inclusions help to create an unusual vivid purple-pink morganite specimen.
Black Diamond with Unusual Color Origin
This black diamond's color was produced by natural radiation stains, an unusual cause of color.
Silicon in Natural Type IIa and Type IaB Diamond
Silicon, normally associated with CVD synthetic diamond, may be found in natural diamond.
Large Synthetic Moissanite with Silicon Carbide Polytypes
Examination of the properties of a synthetic moissanite specimen submitted as a black diamond.
Spinel Submitted as Diamond
It is a rare occurrence when a diamond simulant submitted to a GIA laboratory turns out to be a natural gemstone.