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.

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.

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.

An eight-rayed star peridot with a star system made up of two different sets of inclusions is described for the first time.

GIA’s Tokyo laboratory examines three grossular garnets displaying six-rayed black inclusions arranged in a snowflake-like pattern.

A 2.50 ct natural type IIa/IaB diamond submitted to the Dubai laboratory shifts to type IIb after deep-UV excitation.

Organic-rich material is observed through an opening in a hollow natural pearl.

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.

The blunt termination of a red manganotantalite inclusion displays a striking contrast against a greenish blue sapphire.