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.
Hydrothermal Synthetic Red Beryl from the Institute of Crystallography, Moscow
Hydrothermal synthetic red beryl has been produced for jewellery applications.
Ruby and Sapphire from Jegdalek, Afghanistan
This study provides detailed mining and gemmological information on the Jegdalek deposit, in east-central Afghanistan, which is hosted by elongate beds of corundum-bearing marble.
Rubies and Fancy-Colour Sapphires from Nepal
Gem-quality rubies and fancy-colour sapphires have been recovered from dolomite marble lenses located high in the Himalayan mountains of east-central Nepal (Ganesh Himal).
Ruby crystals from Southeast Asia with a fixed six-rayed star, similar in effect to trapiche emeralds from Colombia, are described.
Rubies from Mong Hsu
Large quantities of rubies—both rough and faceted—from a commercially important new source in Myanmar (Burma) have been available on the Bangkok market since 1992.
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.
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.
Status of Ruby and Sapphire Mining in the Mogok Stone Tract
This article, based on two recent visits to Mogok, briefly reviews the mining history and geology of this extraordinary locality, and describes the current status of mining and the methods used to recover rubies and sapphires in the Mogok area.
New Rubies from the Morogoro Area, Tanzania
The authors present the mineralogical and gemmological properties of rubies found recently in the Morogoro area of Tanzania that have many features in common with rubies from Myanmar (Burma) and other comparable marble-type deposits.