Article Search Results

Show Filters
Showing 16 results for "*"
Fluorescence image of Aurora Butterfly of Peace
An Introduction to Photoluminescence Spectroscopy for Diamond and Its Applications in Gemmology

Presents the underlying physics and methodology of this analytical technique, which has become an essential tool in identifying treated and synthetic diamonds.

Read More

Fluorescence produced by optical defects in diamond: measurement, characterisation and challenges

How variations in UV lamp output can affect observed fluorescence colour and intensity.

Read More

Coloured Diamonds in the Aurora Butterfly of Peace Collection
The “Type” Classification System of Diamonds and Its Importance in Gemmology

Knowledge of type allows gemmologists to better evaluate if a diamond might be treated or synthetic, and whether it should be sent to a laboratory for testing.

Read More

Abstract Header from the 2009 issue of Gems & Gemology
Abstracts; Summer 2009

This article, from the Summer 2009 issue of Gems & Gemmology, is a compilation of abstracts of important gemmology-related articles published outside of Gems & Gemmology.

Read More

Star of the South: A Historic 128 Ct Diamond

This article presents the first complete gemmological characterisation of the historic 128.48 ct Brazilian diamond known as the Star of the South.

Read More

10 Study Samples Before and After HPHT Processing
GE POL Diamonds: Before and After

This article explores and identifies the changes that type IIa GE POL diamonds experience before and after HPHT annealing.

Read More

0.20-ct Diamond
A Visual Guide to the Identification of Filled Diamonds

This article illustrates the various features in filled diamonds and explores the best techniques for examining them.

Read More

GIA’s Symmetry Grading Boundaries for Round Brilliant Cut Diamonds

A presentation of parameters used to support GIA's symmetry grading system.

Read More

Colour Grading “D-to-Z” Diamonds at the GIA Laboratory

This article discusses the history and ongoing development of GIA's colour grading system, and explains how its laboratory applies it.

Read More

Fingerprinting of Two Diamonds Cut from the Same Rough

With the information from a combination of tools now available, the sophisticated gemmologist can fingerprint a given stone.

Read More