by John L. Emmett & Richard W. Hughes
Trust  |  The Ethics of Gem Treatment Disclosure

The ethics of gem enhancement disclosure.

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by Richard W. Hughes
Passion Fruit  |  A Lover's Guide to Sapphire

Sapphire is one of the classic gems. In this article, Lotus Gemology's resident connoisseur casts a discerning eye at the factors that contribute to quality in this legendary precious stone.

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by Richard W. Hughes
Seeing Red  |  A Guide to Ruby Connoisseurship

A loving look at ruby from the standpoint of the connoisseur.

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by Richard W. Hughes & Vincent Pardieu
Downtown: Gem hunting in Central & Southern Tanzania  |  Lotus Gemology

Since the late 1960's, East Africa has been home to some of planet earth's greatest gem discoveries. And yet, little has been written about certain of these finds. In the autumn of 2007, the authors set out to fill in the gaps, specifically regarding Tanzania's Mahenge, Songea and Tunduru regions.

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by Vincent Pardieu & Richard W. Hughes with Guillaume Soubiraa, Michael Rogers, Warne & Montgomery Chitty & Philippe Brunot
Working the Blueseam  |  The Tanzanite Mines of Merelani

An over-and-underground look at the tanzanite mines of Merelani.

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by Richard W. Hughes, Thanong Leelawatanasuk, Wimon Manorotkul, Bonita Kwok, Lore Kiefert & Anne Carroll Marshall
The Chinese Box  |  A Guangzhou Jade Market Puzzle  |  Lotus Gemology

An investigation into nephrite and imitation nephrite pebbles purchased in Guangzhou, China's Hualin Street jade market.

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by John L. Emmett & Richard W. Hughes
Betwixt Two Worlds: A Search for Gemology in the 21st Century

Traditional gemology considers itself a science, but typically omits a key element of the scientific method. And is gemology simply a science, or something more? Read on to learn the answer…

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by Richard W. Hughes
Inside Out  |  Inclusions and the Symmetry of Crystals

A discussion of how inclusion patterns mimic crystallographic symmetry in ruby and sapphire.

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by Thanong Leelawatanasuk, Wilawan Atichat, Visut Pisutha-Arnond, Pornsawat Wattanakul, Papawarin Ounorn, Wimon Manorotkul & Richard W. Hughes
Cobalt-Doped Glass-Filled Sapphires  |  An Update  |  Lotus Gemology

The history of glass-infilling in blue sapphire, along with a description of the latest treatment generation developed in Chanthaburi, Thailand.

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by John I. Koivula & Richard W. Hughes
Living in the Dark Ages  |  The Fiber-Optic Light

The role of fiber-optic lighting in gemological microscopy.

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