General Questions:
1-800-421-7250
G&G announces the winners of the Dr Edward J. Gübelin Most Valuable Article Awards for 2019.
Read MoreTraditionally, sapphire symbolises nobility, truth, sincerity and faithfulness.
Read More
GIA’s services and instruments have grown in importance and impact as new gem treatments and laboratory-grown gems have entered the market.
Read More
Colombia is home to a rainbow of gems, but emeralds – and the tales of lore that surround them – are the country’s most well-known treasures.
Read More
A look at the mining and distinguishing characteristics of this naturally vibrant blue sapphire.
Read More
A look at the mining and distinguishing characteristics of this naturally vibrant blue sapphire.
Read MoreThe heat treatment of corundum involving lattice diffusion of beryllium (Be) at temperatures over 1800°C has become a major issue in the gem trade.
Read More
Natural pearl identification is one of the critical problems in pearl research. The DNA study of pearly molluscs and oysters facilitates the solving of this problem. To fulfil this goal, GIA sent a group from both Research and Education to Tennessee to sample the freshwater molluscs for DNA bar-coding. Come with us to Camden, Tennessee, to see how we dive for pearly shells.
Read More
For eight decades, Gems & Gemology, GIA’s peer-reviewed quarterly journal, has educated generations of readers and protected the gem-buying public. We share ten landmark articles that were particularly significant to gem and jewellery professionals.
Read More
The gemstones that adorn a late-16th-century ciborium from Einsiedeln Abbey in Einsiedeln, Switzerland.
Read More
