The fee for the GIA Laboratory-Grown Diamond Quality Assessment is US$15 per carat, with a minimum fee of $15. Submissions that do not meet the minimum criteria for assessment will be charged a US$5 ...

Since its discovery at the beginning of the nineteenth century, infrared light has proven to be a versatile tool for scientists, industrialists, and consumers. The gem industry has benefited from the ...

The museum’s mineral reference collection is one of three in the Department of Mineral Sciences: minerals (including gems), meteorites, and rock and ore. Dr. Post explains that this part of the museum ...

Sri Lanka has two monsoon seasons that occur at different times of the year depending on the part of the country. The northeast has monsoons from December through March. In the southwest, where most ...

During an expedition to China, a GIA team was introduced to the largest jadeite boulder being carved. This amazing blend of nature’s beauty and man’s artistry is an ongoing project to which master ...

Filigree inlay art originated in the Warring States Period (475-221 BC). At the time, it was called “Jin Yin Cuo,” which involved painting gold and silver on the surface of bronze artworks. With the ...

We’ve traveled to the Carnegie Institution of Washington—more specifically the Institution’s Department of Terrestrial Magnetism—to document Dr. Shirey’s work on determining the age of diamonds from ...

Once a gem is submitted: Your name or store info is removed, so analysis is completely unbiased. Every gem, whether from a local jeweler or a globally recognized brand, is evaluated using the same ...

Join a GIA team on a visit to the bustling jadeite trading centers of Guangdong Province, China. You'll observe a market understood by few Westerners, as industry leaders explain the intricate details ...

Aquamarine and heliodor are colored by Fe ions, an important coloring agent for beryl. Blue to yellow gem beryl was studied by quantitative spectroscopy and trace-element analytical techniques to ...

Blue zircon is perhaps best known from Cambodia, with most if not all of the material recovered as brown stones that turn blue upon heating. Recently, Brent Smith of Phoenix Gems supplied us with a ...

The following guide will give a short description of the treatment process, some gems for which the process is used, how easy or difficult the treatment is to detect for a trained gemologist, how ...