Article Search Results

Show Filters
Showing 23 results for "*"
Yellow diamond 17.88 ct., in tweezers, in front of selection of white octahedra, 34.11 ctw. These diamonds came from Kao Mine, Lesotho.
Rough Diamond Auctions: Sweeping Changes In Pricing and Distribution

Examines the growing percentage of rough diamonds being sold through auctions, a shift that has caused price volatility while opening up supply to more manufacturers and dealers.

Read More

Study sample emeralds
A Preliminary Study on the Separation of Natural and Synthetic Emeralds Using Vibrational Spectroscopy

Reports preliminary findings—based on FTIR and Raman spectrometry of more than 300 samples—on distinguishing natural and synthetic emeralds using vibrational spectroscopy.

Read More

Argyle pink diamonds
Exceptional Pink to Red Diamonds: A Celebration of the 30th Argyle Diamond Tender

Describes the extremely rare polished pink diamonds from Australia’s Argyle mine that have been sold for 30 years through invitation-only tenders.

Read More

Blue Moon, rough and cut
Study of the Blue Moon Diamond

Presents spectroscopic and phosphorescence data of the Blue Moon, a 12.03 ct Fancy Vivid blue diamond discovered at the historic Cullinan mine in early 2014.

Read More

Sri Lanka: Expedition to the Island of Jewels
Sri Lanka: Expedition to the Island of Jewels

Offers a first-hand look at Sri Lanka’s mining, cutting, jewellery manufacturing and retail sectors, where tradition and innovation converge.

Read More

IMG - WN13 long 157468 300x169 hero
Update on gemstone mining in Luc Yen, Vietnam

Explores the emergence of the Luc Yen area as a producer of corundum, spinel, tourmaline and other coloured stones.

Read More

Sapphires from Antsiranana Province, Northern Madagascar
Sapphires from Antsiranana Province, Northern Madagascar | Gems & Gemology

Since 1996, large quantities of yellow to blue sapphires have been recovered from alluvial deposits derived from basaltic rocks in northern Madagascar.

Read More

Ruby and Sapphire from the Southern Ural Mountains, Russia

Primary occurrences of ruby, pink sapphire, sapphires of other colours and spinel have been found in marbles in the Ural Mountains.

Read More

Update on Mining Rubies and Fancy Sapphires in Northern Vietnam

Northern Vietnam began producing significant quantities of rubies and fancy sapphires in the late 1980s.

Read More

The Indaia Sapphire Deposits of Minas Gerais, Brazil

The discovery of significant quantities of gem-quality sapphire in Minas Gerais could add corundum to the formidable list of gem species already commercially produced in Brazil.

Read More