Background
O'Donoghue, Michael John was born on November 30, 1934 in Leicester, United Kingdom. Son of Desmond and Sarah Ann (Ward) O'Donoghue.
(The book describes a wide range of gem and ornamental mat...)
The book describes a wide range of gem and ornamental materials, species by species, opening up the secrets they sometimes conceal. The book reveals when gemstones can be artificially manufactured, when they can be synthesized or cleverly imitated by other materials - like glass - and when their colour has been enhanced, permanently or for a short time, by the hand of man. Readers are told and shown what the tell-tale features are and learn that while nothing is quite what it seems there are ways in which they can spot give-away signs without needing to consult a laboratory. The book is ideal for the jeweller, the auction house expert, the gemmologist and the mineralogist who will find a new slant on the materials that begin a somewhat less glamorous life as rough specimens.
http://www.amazon.com/gp/product/0750631732/?tag=2022091-20
( Artificial gemstones have been well established in the ...)
Artificial gemstones have been well established in the jewel trade for some time, but following further refinements in their manufacture, gemologists worldwide are facing increasing problems with their identification. Today, for instance, gem-quality synthetic diamonds—once deemed impossible to produce—are becoming widely available. The synthetic products of the past are still available as well, and often prove puzzling to newer generations of gemologists. Starting with the theory of synthetic gem manufacture and an explanation of the production methods used for growing and improving crystals, this definitive guide to the various manmade gem substitutes goes on to identify all existing artificial substances. The identifying internal and external features and tests are addressed, and color photographs illustrate the tell-tale features of both artificial and naturally occurring substances. Gemologists, gem dealers, curators, amateurs, and students alike will find this an indispensable resource.
http://www.amazon.com/gp/product/0719803314/?tag=2022091-20
(This title is now in paperback for the first time.Artific...)
This title is now in paperback for the first time.Artificial gemstones have been well established in the trade for some time, but now, following further refinements in their manufacture, gemmologists worldwide are facing increasing problems with identification.Today, gem-quality synthetic diamonds, once deemed impossible to produce, are becoming widely available, and, moreover, it is possible to create almost any major gemstone in whatever colour is desired. Then, too, the growth of diamonds by chemical vapour deposition is destined to present further problems. The synthetic products of the past, particularly of the 1960s, are still available, and are puzzling the newer generations of gemmologists who have not encountered them previously.In "Artificial Gemstones", Michael O'Donoghue provides the definitive guide to the various manmade substitutes thus enabling anyone handling gems to identify them accurately. Starting with the theory of synthetic gem manufacture and an explanation of the production methods used for growing and/or improving crystals - with their ornamental application - the book moves on to list and identify the materials themselves. Some of these have natural counterparts; others are new minerals and do not occur in nature. The author lists the identifying internal and external features and tests, and the book contains colour illustrations to display the inclusions found in transparent materials. The book is completed by an extensive bibliography and a useful appendix of trade names.Gemmologists, gem dealers, lapidaries, curators, amateurs and students of gemmology and mineralogy will all find this an indispensable addition to their bookshelves.
http://www.amazon.com/gp/product/B00GXFOUS4/?tag=2022091-20
educator Gemmological association executive
O'Donoghue, Michael John was born on November 30, 1934 in Leicester, United Kingdom. Son of Desmond and Sarah Ann (Ward) O'Donoghue.
Master of Arts, Cambridge (England) University, 1962.
Curator The National Library Scotland, Edinburgh, 1960-1962, British Museum, London, 1962-1991. Lecturer, head gemmology London Metropolitan University, since 1991. Director Gemological Association and Gem Testing Laboratory of Great Britain, since 1998.
Member International Liaison Group Gold Mineralization, since 2000.
( Artificial gemstones have been well established in the ...)
(The book describes a wide range of gem and ornamental mat...)
(This title is now in paperback for the first time.Artific...)
( Today buyers cannot be sure whether or not a gemstone i...)
Leader The Samaritans, London, 1967—1991. Chair Sevenoaks Early Years Forum, 1993—1998. Vice chair Age Concern, since 1997.
Pastoral assistant St. John's Church, England, since 1989. Lay chaplain Rochester Cathedral. Fellow: Gemmological Association Great Britain (council member 1971-1985, board directors since 1998).
Member: Deutsche Gemmologische Gesellschaft (council member), Mineralogical Society, Geological Society London (member library committee).
Married Elizabeth Anne Borley, February 26, 1968. Children: Lucy, Clare, Peter.