The Gemological Institute of America (GIA) has unveiled a curated collection of red, white and blue gemstones and pearls to commemorate the 250th anniversary of the United States of America. The initiative explores the scientific properties, rarity and jewellery applications of gemstones representing the three colours associated with the national palette.

According to GIA, the collection includes rubies, red spinel, rhodochrosite, red beryl, zircon, beryllonite, apophyllite, pearls, blue spinel, dumortierite, euclase and benitoite. The selection also features a carved ruby depicting Abraham Lincoln and naturally formed pearls, demonstrating a range of cutting styles and natural formations.

“Red, white, and blue are instantly recognizable, but in gems and pearls, they are far from uniform. This mix highlights how those colors show up across different materials, offering a fresh perspective on a familiar palette,” said Nathan Renfro, Senior Manager of Colored Stones Identification at GIA.

The collection examines the geological origins and optical properties of each material. GIA notes that ruby and red spinel derive their red colour from chromium, while rhodochrosite and red beryl owe their appearance to manganese. Colorless gemstones such as zircon, beryllonite and apophyllite illustrate different light-reflecting characteristics despite lacking colour-causing trace elements.

Among the blue gemstones, benitoite, California’s state gemstone, is presented alongside blue spinel, dumortierite and euclase. GIA explains that trace elements including iron and cobalt influence blue hues, while mineral structure affects brilliance and visual appearance.

The institute also highlights pearls as biominerals formed by living mollusks rather than within the earth, noting their historical significance in jewellery before the widespread availability of cultured pearls.

Through the collection, GIA aims to demonstrate how crystal structure, formation processes and craftsmanship influence the appearance of gems and pearls beyond colour alone, offering educational insights relevant to gemology and jewellery design.