Article Search Results

Show Filters
Showing 11 results for "*"
Rough CLIPPIR diamonds
The Very Deep Origin of the World’s Biggest Diamonds

Explores an exceptional family of diamonds, referred to as “CLIPPIR” (Cullinan-like, Large, Inclusion-Poor, Pure, Irregular and Resorbed), that formed in a super-deep environment.

Read More

Drilled natural pearls examined in this study.
Saltwater Pearls from the Pre- to Early Columbian Era: A Gemmological and Radiocarbon Dating Study

Examines 85 saltwater natural pearls, reportedly harvested from the Caribbean islands off the coast of Venezuela during the early 16th century, to determine their age.

Read More

GemCad View of the French Blue Enclosed Within the Tavernier Blue
A Crystallographic Analysis of the Tavernier Blue Diamond

This study uses both historical information and modern data to create a computer model of the Tavernier Blue, orienting the finished diamond within the original diamond crystal.

Read More

The Cullinan Diamond Centennial: A History and Gemmological Analysis Of Cullinans I And II

Eight decades after the Cullinan diamond was mined, a team of gemmologists examined the two famous gems that were created from it to become part of the Crown Jewels of England.

Read More

A History of Diamond Sources in Africa: Part II

This article explores the mining developments and new diamond occurrences in Africa that led to many of the key concepts in modern geology.

Read More

Estimating Weights of Mounted Coloured Stones

Updated formulas are presented for estimating the weights of mounted coloured gemstones.

Read More

Modern Diamond Cutting and Polishing

Over the last 25 years, the diamond-cutting industry worldwide has been revolutionised by sophisticated instruments that provide invaluable aid in the process of creating a polished gem.

Read More

The Changma Diamond District, Mengyin, Shandong Province, China

One of China's most important discoveries to date is the Changma kimberlite district in Shandong Province.

Read More

The Rubies of Burma: A Review of the Mogok Stone Tract

A review of the history of this area, its geology, and the mining methods that have predominated.

Read More

An Important Exhibition of Seven Rare Gem Diamonds

The stories behind seven strikingly beautiful rare natural diamonds, united in an exhibit at the Smithsonian, are told here.

Read More