Research Article Search Results

Melee diamonds can be efficiently screened for synthesis and treatment using infrared absorption spectroscopy, DiamondView imaging, and microscopy.

A report on what appears to be the first non-nacreous beaded cultured pearl examined by a laboratory.

Samples composed of lawsonite pseudomorphs were coated to make them appear deep green and imitate chromian lawsonite crystals.

An oval-shaped faceted stone resembling an emerald proved to be a doublet with a beryl top and a topaz bottom.

A very large diamond with a Fancy Vivid yellow color was identified as artificially irradiated.

Ten loose pearls with interesting shapes and internal growth features were from Pteria-species mollusks.

A large scale gemstone mining company seeks to change the way the world acquires and sells fine gemstones.

Jewelers and gemologists use a specific set of terms to describe parts of a polished diamond. Certain measurements of the shape or proportions ultimately have an affect on the round brilliant diamond’s cut grade.

Join GIA on location at the Kagem emerald mine in Zambia and get an overview of what may be the largest emerald mine in the world. It’s an operation that is helping to revolutionize the colored gemstone industry.

Join GIA on location at the Montepuez ruby mine in Mozambique, the most important ruby discovery of this new century.

Offers a firsthand look at Sri Lanka’s mining, cutting, jewelry manufacturing, and retail sectors, where tradition and innovation converge.

A rare look at natural pearls from a known Spondylus species, commonly called “thorny” oysters.