A 37.41 ct natural rough diamond with distinct pink and colorless zones is examined at GIA’s Botswana laboratory.

Examination of a Fancy Deep brownish orangy pink diamond reveals evidence of treatment to enhance its color.

A 63.17 ct dumortierite rough crystal is examined in the Bangkok laboratory.

The Carlsbad lab receives a laboratory-grown colorless sapphire with weblike fractures containing concentrations of dye.

Clusters of micro-inclusions form starburst-patterned clouds in a 2.50 ct Faint yellow-green round brilliant diamond.

Natural pearl cores are used to simulate the appearance of natural pearl growth in two assembled pearls mounted in a pair of earrings.

Investigates the morphological changes of macle diamonds during the growth process by exploring their three-dimensional internal zonal structure.

Investigates deposits known for producing multiple gemstone species and the conditions that create their distinct geological settings.

A photo tour of the GIA Museum’s latest exhibit featuring extraordinary crystals and gems central to the cultures of southern Asia.

Showcases the diverse natural shapes of rough diamonds and explores how geological processes create their unique forms.

Examination of four heart-shaped pearls reveals cavity filling and plugging to improve durability.

Armenite is submitted for the first time to the Carlsbad laboratory.

A pink spinel hosts a richly textured, opaque metallic inclusion.

A pink oval conch pearl displays firework-like flame patterns.

Multiple vivid blue lazurite inclusions are observed in a near-colorless scapolite.

GIA studies a selection of rough and cut garnet from a new source in northern Vietnam.

A report on the increase of artificially assembled or altered specimens circulating in Pakistan’s local gem markets.

A precious cat’s-eye boulder opal from Australia is examined in the Carlsbad laboratory.

Presents a comprehensive analysis of the gemological, spectroscopic, and trace element characteristics of a set of Shaanxi emerald samples based on standard and advanced gemological methods.

Reports on a new source of primary gem-quality sapphire from Montana, comparing its inclusions and trace element chemistry with those from secondary sources in the state.