Research Article Search Results

The first installment of this column explores the potential role of modern-day deep-focus earthquakes on diamond growth.

GIA’s New York laboratory reports on a 15.10 ct (17.47 × 11.53 × 7.94 mm) Fancy Vivid blue cut-cornered rectangular step cut named the De Beers Cullinan Blue diamond.

A gemological analysis of blue Burmese sapphires from Mogok, based on a series of field expeditions over the last decade.

Contributes to the mining history of Austria’s Habachtal region, which is believed to be one of the earliest emerald deposits.

GIA’s New York laboratory reports a new record size for CVD laboratory-grown diamond.

A selection of 74 non-bead cultured and 12 bead cultured pearls grown in cultured pearl sacs and harvested directly from operated mollusks were collected and their internal structures examined using real-time microradiography and X-ray computed microtomography analyses.

Analyzes a group of 23 freshwater “Edison” pearls (a trade name referring to near-round freshwater cultured pearls, usually shell bead cultured) using various gemological and advanced instrumental techniques.

Provides a visual guide to GIA’s approach to classifying and describing pearls.

Using customized, image-based measurement systems to quantify the effect of fluorescence on the color, brightness, and transparency of gem diamonds viewed in both face-up and table-down orientations.

Presents a method for accurately predicting the color of a gem material when viewed in any direction as long as the polarized spectra and the viewing angle relative to the c-axis are known.

Presents the internal characteristics of natural P. maxima pearls, obtained from real-time microradiography (RTX) and X-ray computed microtomography (µ-CT) analysis of 774 samples.

Diamond ages offer insight into continent evolution spanning billions of years.