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

Both asterism and chatoyancy are observed in a color-change sapphire.

Large near colorless, blue, and yellow diamonds broke auction records at Christie’s and Sotheby’s in the first half of 2022.

GIA’s New York laboratory reports on a 15.10 ct Fancy Vivid blue cut-cornered rectangular step cut named the De Beers Cullinan Blue diamond.

Fiber-optic light creates a night sky scene in a yellow sapphire from Madagascar.

After a slow start, the spring 2023 auction season ends with multiple broken records.

Gemstones formed in metamorphic environments offer insights into the earth’s history and the evolution of tectonic activity that led to their formation.

An exceptionally large South Sea bead cultured pearl is examined at GIA’s Mumbai laboratory.

Isolated nitrogen confined to the outer surface of a 0.98 ct diamond causes “yellow skin.”

Microscopic observation unveils the first known instance of skeletal metallic inclusions in Brazilian Paraíba tourmaline.

An iridescent feather inclusion in natural diamond bears resemblance to Rainbow Mountain in Peru.

Pinkish orange crystal inclusions in a faceted quartz are identified as the rare phosphate mineral triplite.