A discussion of the ethics of gem treatment disclosure, a comparison of gem treatments, and the crisis these could bring to the industry if mishandled.

The following interview with Richard W. Hughes appeared in Australian Jeweller, May 1998, p. 10.

Links to websites related to gemology, gemstones, minerals and jewelry.

Do men and women have the same ability to see red? The answer might shock you.

Introducing the blue filter as a gemological tool to separate natural and Verneuil synthetic yellow sapphires.

The use of Fourier-Transform Infrared Spectroscopy (FTIR) in gem identification, with examples of sapphire & jadeite.

Surface ('bulk') diffusion-treated corundums (SDTCs) created a stir in the Bangkok market in 1990. This article looks at the original patents and cont...

A description of the fracture healing of Mong Hsu ruby, along with the problems this has created in the gem trade.

An essay on how gemology, in focusing solely on analysis, has lost sight of the most important part of a gem – its beauty.

Gübelin, Eduard J. & Koivula, John I. (2005) Photoatlas of Inclusions in Gemstones, Volume 2. Opinio Publishers, Basel, Switzerland, 830 pp. ISBN 978-3855040957

Gübelin, Eduard J. & Koivula, John I. (2005) Photoatlas of Inclusions in Gemstones, Volume 3. Opinio Publishers, Basel, Switzerland, 672 pp. ISBN 3-03999-047-4

Ruby & Sapphire Richard W. Hughes  |  1997 Ruby & Sapphire is widely acknowledged as one of the finest gemology books ever published. Not ju...

Quotes from some of the rave reviews of the 1997 gemological classic, Ruby & Sapphire, by Richard W. Hughes.

The chapter on ruby and sapphire from Burma (Myanmar) from Richard Hughes' 1997 book, Ruby & Sapphire.

This is the chapter on ruby and sapphire from India (including Kashmir sapphire) from Richard Hughes' 1997 book, Ruby & Sapphire.

Ruby & Sapphire  •  A Collector's Guide Richard W. Hughes  |  2014 Few gems capture the imagination like ruby and sapphire. This book removes th...

Ruby & Sapphire  •  A Gemologist's Guide Richard W. Hughes, with Wimon Manorotkul & E. Billie Hughes  |  2017 Designed as a companion to Rub...

An examination of the problem of separating pink sapphire and padparadscha from ruby.

A discussion of rutile silk in corundum (ruby & sapphire) and its use in detecting artificial heat treatment. Careful examination of these "silk" inclusions can provide vital clues to unmask heated gems.

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.