The more than 60 scientists, engineers, gemologists and technicians of GIA’s global research team met November 1-3 at the Institute’s world headquarters in Carlsbad, CA.

A recap of the second annual Turquoise United Conference.

A report on the seventh annual Chicago Responsible Jewelry Conference.

Examination of a heart-shaped ruby reveals a zinc glass filler.

A greenish blue spinel displays a large network of needle-like dislocations clustered in a six-rayed star pattern.

A precipitation of an unidentified mineral creates a complex moiré pattern in a fissure of a purple spinel.

Fiber-optic illumination reveals rectilinear zigzag-patterned films with vibrant colors in a blue sapphire.

Blade-like magnetite inclusions developed from a healed fracture in peridot resemble a dark, rainy afternoon in a lakeside city.

An 8.33 ct rectangular heliodor displays two tourmaline inclusions and a thin band of fluids.

The quality and size of this 4.04 ct CVD-grown diamond ring demonstrate the advancing technology in laboratory-grown diamonds.

Transparent crystal inclusions and gas bubbles are observed in a garnet-topped doublet.

A Guatemalan jade called yongchuliao has gained popularity among Chinese buyers.

An etch channel in the crown facets of a diamond resembles a mace-like weapon.

Zigzag lines are observed only with oblique light in a 55 ct aquamarine.

Trigons and tetragons observed in a chameleon diamond indicate both octahedral and cubic growth.

Investigates the various chromophores responsible for color in four types of yellow sapphire.

An overview of the Fall 2023 Gems & Gemology content.

Examines dissolution features of heliodor and green beryl from a Ukrainian pegmatite field and offers criteria to distinguish them from samples found in other localities.

Details the colors and optical effects caused by metallic copper inclusions in this gem-quality feldspar.

Reports on the geological setting and gemological properties of violet-blue gem cordierite from new deposits located in British Columbia.