GIAに宝石をご提出いただく場合は、ラボサービスアカウントを開設していただく必要があります。アカウントはすべてオンラインで簡単に開設していただけます。 アカウントを開設するため ...
GIA’s laboratory in Bangkok, Thailand conducts research and provides services such as diamond grading and origin determination, colored stone grading and origin determination and pearl identification ...
The People's Republic of China has recently placed a high priority on identifying and developing its gemstone resources. Initial exploration by teams of geologists throughout China has identified many ...
During the last 20 years, Australia has assumed a major role in the production of blue sapphire. Most of the gem material comes from alluvial deposits in the Anakie (central Queensland) and New ...
The GIA Memo Creator makes it easier than ever to submit your gems to GIA for grading and analysis. The GIA Memo Creator connects directly to your client portal account, so your information is ...
Surface-treated topaz has become a viable alternative to topaz colored by irradiation. Unlike irradiation, which modifies the entire gemstone, coloration by chemical modification is limited to the ...
Synthetic diamond growth was first documented in 1952 by William Eversole of the Union Carbide Corporation, but it took another two decades before GIA issued the first grading report for a ...
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