A pink-diamond ring will be one of the leading lots at the upcoming Bonhams sale in Hong Kong, where it is expected to bring in up to HKD 5 million ($640,000). The ring features a modified shield ...

Established in 1931, the Gemological Institute of America (GIA) is the world’s foremost authority on diamonds, colored stones, and pearls. A public benefit, nonprofit institute, GIA is the leading ...