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Less expensive, faster and more accurate than manual methods.

Simple To Use Tools!

  • Diamond Weight Estimations
  • Colored Stone Weight Estimations
  • Gemstone Database (over 450 Gems)
  • Gemstone Separator
  • Inclusion Gallery (over 550 photos)
  • 1300 Gemstone Photos
  • Color Gemstone Spectrum Images (both Prism and Diffraction with the option of Red 700 on the right or the left)

Gem Contributors

Without the efforts of these amazing people Gemology Tools Professional wouldn't be near the program it is today.

Martin Fuller, GG, MGA, ASA, NAJA Certified Senior Appraiser Fuller and Associates

Fuller and Associates are Certified & Recertified - Licensed & Bonded - Independent Jewelry Appraisers For Precious Gems, Gold, Platinum, Pearls and Silver. You can view their website at:

Martin is a past President of The Gemological Institute of America (G.I.A.) Alumni Association (, Washington, D.C. Chapter 2002-2003, Past President (1992-1993), Vice-President (1990-1991), Founder & Former Publisher and Editor of "The District of Gemology", award winning newsletter to the industry. Co-Founder and Editor of the website of the Washington, D.C. Chapter of the GIA Alumni Association.

Contributions: Inclusion Photographs, Gemstone Photographs and Much More!

Barbara W. Smigel, PhD. Graduate Gemologist, GIA Artistic Colored Stones

Barbara developed her interest in gems rather later in life than many (after age 40). The earlier part of her life having been devoted to researcher and teaching in biological science and to raising a family. From an initial interest in collecting rare gems, the progression was to gemology student (culminating in a Graduate Gemologist diploma from GIA), to a becoming a facetor and jewelry designer, and ultimately reaching its present form as gem dealer and gemology instructor. Her website,, debuted on the internet in 1997 and has evolved to become one of the preferred web destinations for the gem lover.


Contributions: Gemstone Photographs, Gemstone in-depth Articles, Inclusion Photographs and Much More!

John I. Koivula

John Ilmarii Koivula has been studying and photographing the microworld of gemstones since 1961. As an extension of his inclusion research and microscopy he has developed several useful illumination techniques applicable to gemology. He introduced fiber optic illumination to gemology and discovered many of the micro-characteristics now routinely used in the separation of treated stones from natural gems, such as internal diffusion in proving treatment, chromophore cannibalization and the usefulness of intact carbon dioxide and other fluid inclusions in proving natural color.

Koivula has authored or co-authored more than 800 articles and notes on gemstone inclusions, microscopy and related topics for a wide variety of professional and trade publications.

He is a contributor to several books including the American Geological Institute's Glossary of Geology, the fifth edition of Robert Webster's Gems, the Gemological Institute of America's (GIA) "Diamond Dictionary," and two forthcoming reference volumes Geologica: A Study of Crustal Landforms and On Gemstones: Gemological and Analytical Studies of Ancient Intaglios and Cameos. Mr. Koivula and Dr. Eduard Gübelin are co-authors of the major gemological reference work, Photoatlas of Inclusions in Gemstones. In addition, John Koivula's book, The MicroWorld of Diamonds, covers natural diamonds, synthetics, simulants, and enhancements. Together with Dr. Gübelin, Mr. Koivula has now completed Photoatlas of Inclusions in Gemstones, Volume 2, which focuses on the identifying characteristics of natural gems, recent synthetics and treated gem materials. Photoatlas, Volume 2 was released in January 2006. Photoatlas of Inclusions in Gemstones, Volume 3, which will conclude the series, was released in late 2008. It includes chapters dedicated to diamonds, emeralds, rubies, and sapphires. In addition, there are 21 chapters on rare stones.

Koivula was instrumental in the development of the "MacGyver" television series for ABC, working as scientific and technical advisor on the show during its seven year run. Before joining the Gemological Institute of America in 1976, he worked in the mining industry performing mineral exploration for Cominco American. He also worked in the retail jewelry industry for several years.

Currently, John Koivula is Chief Gemologist of the Gemological Institute of America, in Carlsbad, California.

Contributions: Inclusion Photographs

Peter Grumitt

A superb incusion microphotographer, Peter runs Apsara. They sell very high quality gems, specializing (but not limited to) Rubies and Sapphires. You will also find excellent inclusion photos on their site.


Contributions: Inclusion photographs

The Gemmological Association of Great Britain

Gem-A is where you get the coveted FGA.


Contributions: Inclusion photographs and retail sales


Independent Appraiser, owner and President Tenhagen Gemological Laboratory, and Joseph W. Tenhagen Appraisals, Inc. 36 N.E. First Street, Miami, Florida 33132 Publisher of the "Diamond Value Index" 1995 to 2000.
Pricing Advisor to “The Guide” 1986 to 2001.
Articles published in: Gems & Gemology, Lapidary Journal, The Jewelry Appraiser, Jeweler Lapidary Business, Miami Diamond magazine, and PreciouStones Newsletter.
Listed in the first Edition of Who's Who in the Jewelry Industry, 1979.

Contributions: Inclusion and gemstone photographs is a German-Thai company located in Chanthaburi, Thailand. We have been selling loose gemstones online for over 6 years, with more than 82,000 gems sold to over 21,000 satisfied customers around the world.

Contributions: Gemstone Photographs

Robert E. La Prad

Graduate Gemologist, GIA - Bob is a gems and jewelry appraiser who has been serving the Santa Barbara, CA area since 1982. He is a Graduate Gemologist (awarded by the Gemological Institute of America) and a Senior Member of the National Association of Jewelry Appraisers. He was tested and certified as an Accredited Senior Appraiser and Master Gemologist Appraiser with the American Society of Appraisers in 1989. He is an expert gem cutter with over 34 years of experience. He has been an independent appraiser since 1990, serving clients from Ventura to Solvang.

Contributions: Inclusion Photographs and Gemstone Photographs

Stan Celestian

Instructor of Astronomy, Geology and Physical Science, Glendale Community College

I received a Masters of Science in Geology / Education from Northern Arizona University, a Bachelor of Science in Geology from the State University of New York at Oswego. I have taught Astronomy, Geology and Physical Science at Glendale Community College since 1976. Integrated into my teaching duties is a deep interest in photography and mineralogy. My wife Susan is the Curator of the Arizona Mining and Mineral Museum and we both enjoy geology as a profession as well as an avocation.

Contributions: Gemstone Photographs

Richard Pongratz, GG

Contributing Microphotographer (Inclusion photographs)

Richard B. Drucker, GG

Publisher of the GemGuide Gemworld International, Inc.

Gemworld International, Inc. is primarily engaged in publishing for the jewelry industry. Our premier publication, The GemGuide, made its debut in 1982. The GemGuide Appraisal Software, which utilizes The GemGuide pricing, has been continually improved upon since its acquisition in May 2002.


Contributions: Pearl grading system and Pearl information

Gary Lowe, GG

Cincinnati Lapidary Service. Stone cutting for the trade (only).

Contributions: Gemstone Photographs and Programming

John Huff, B.S., J.D.

Owner - GemCollections/ Gemologist - research in spectrography, photomicrographs of gemstone inclusions (published one dvd), many of which are included in GT Pro and on Microscopist using novel techniques to seek out illusive, identifying inclusions epecially in spinels. Employing infrared and hi-power instruments with experimental filtering and lighting techniques.

Dealer, wholesaler, occasional retail seller.

Contributions: Gemstone Photographs and Inclusion photomicrography

James Carpenter & Cindy Fowler - Unconventional Lapidarist

The Unconventional Lapidarist was started in order to produce and sell high quality products and the rare and unusual to feed the craving of others wanting great products but do not have to dig, cut, and polish the material themselves. I, James, and my partner Cindy, make it a priority to find the best material at fair prices. We have a high quality standard which makes us very selective in what we obtain.

Contributions: Gemstone Photographs

Conny Forsberg, FGA

Nationality: Swedish

Gemological education: Gem-A 1986-1987, diploma 1987. Diamond grading HRD, Antwerp 1993.

Gemological experience: RUBECO, Sweden 1987 - 1990, GeoCity, Sweden 1991 - 1993, Octahedron AB, Sweden 1993 - 1998.

My interest in photographing inclusions in gemstones, crystals and minerals was born when using the microscope to identify gemstones. My first attempts at capturing what I saw through the microscope were done during the mid 80's. By then I used diapositive 135 film and a home- made adapter fitting over the ocular tube.

Contributions: Gemstone Inclusion Photographs

Raul Berenguel

Contributions: Programming, Artistic Critique

Hamid Usman. Khattak

Working as a gemologist and teaches gemology at the Gems & Gemological Institute of Pakistan (GGIP) –Peshawar, Has an Accredited Gemology Diploma from Asian Institute of Gemological Sciences (AIGS) Bangkok, Thailand.

Contributions: Gemstone Inclusion Photographs

Sylvia Gumpesberger

Sylvia Gumpesberger is presently on the Faculty at George Brown College in Toronto, teaching gemmology and illuminating the wonders and characteristics of gems and minerals to jewellery and gemmology students.  Professionals and enthusiasts quickly embrace Sylvia’s innovative approach to the study, including magnetic characterization of gems, which has proven to be a benefit to the industry.  See Sylvia’s related article online at:

Contributions: Magnetism

Gerald Giester, Ao. Univ.-Prof. Mag. Dr.

Born: 9.1.1960 in Steyr, Upper Austria

1978-1984 - University of Vienna, teaching post in biology
M.S. 1984
1982-1990 - Study of Earth Sciences at the University of Vienna
Ph.D. in Mineralogy and Crystallography - University of Vienna 1990

Since 1999: Associate Professor for Mineralogy and Crystallography at the University of Vienna
1999-2003: Associate Editor for American Mineralogist
Since 2010: Associate Editor for Neues Jahrbuch für Mineralogie

Dr. Giesters accomplishments in the fields of gemology and mineralogy are far to numerous to be included here (my comments, BW). If want to see more go to this site:

Contributions: Gemstone Photographs

Thomas Sadel - Sweet Gemstones opened up its' internet doors in 2001 representing many cutters with unusual materials from different parts of the world. All photographs are taken by Thomas Sadel

Contributions: Gemstone Photographs

Luke Charter

Laboratory Director for the Gemmology Institute of Southern Africa". Our website is

Contributions: Gemstone Photographs

Shane Jackson - Jackson's Gems

PO Box 224
Spindale, NC 28160

Importer of high quality facet rough, custom cutting, wholesale lapidary supplies and diamond semi mounts to the public.

Contributions: Gemstone Photographs

Ammolite Guaranteed

Beautiful ammolite gems with a life-time guarantee.

Contributions: Ammolite Photographs

Opals Down Under

Opals Down Under is a reputable family business which has been operated by the Stein family since 1985 on Queensland's Sunshine Coast. Our opal catalogue is updated frequently and gives you the opportunity to buy precious opal at reasonable prices with the knowledge that it has been specially selected and cut by one of Australia's leading opal experts.

Contributions: Opal Photographs

Internet Opals from Coober Pedy

An outstanding and unique opal site in Coober Pedy, South Australia, that brings beautiful opals, opal rings, opal jewelry and opal rough direct from the opal miner to you.

Contributions: Opal Photographs

National Association of Jewelry Appraisers

Gail Levine - Executive Director

PO Box 18
Rego Park, NY 11374-0018

Fax 718.997.9057

Contributions: Diamond cut grading system

Mark Cartwright, GG (GIA), CGA, ISA-AM

Contributions: Inclusion Photographs

Dr. Claudio Cardella, Graduate Gemologist, GIA

Claudio, at present an academic in Aerospace Engineering researching and teaching at the University of Rome, has developed a special love and experience for gems and gemology while travelling extensively in gem producing countries. His Graduate Gemologist Diploma from GIA is just the starting point toward a deeper involvement in researching, appraising, and trading gemstones. The website he created with friends, all very expert in sourcing the choicest gems throughout the world,, has just made its debut on the internet.

Contributions: Inclusion Photographs

Peter Torracca

Contributions: Inclusion Photographs

Kathy Delker, GG (GIA)

Member, NAJA

Contributions: Inclusion Photographs

Dr. Laurent SIKIRDJI

Contributions: Inclusion Photographs

Brad Payne, GJG (GIA)

Contributions: Gemstone Photographs

Edward Bristol

Contributions: Gemstone Photographs

Larry Folkman

Contributions: Gemstone Photographs

Jewelry & Mineral of Las Vegas

Contributions: Gemstones to Photograph

Carlo Pellegrini

Carlo was born in Rome and still lives there. He is 34 years old and holds a degree in Natural Science. He is studying gemology with G.I.A. in Florence. He works in the Vatican City State in the office of Ufficio delle Celebrazioni Liturgiche del Sommo Pontefice. His job is to record and catalogue (pictures, historical researches, etc...) all the liturgical objects and vestments given to the popes in the last centuries and, of course, to the present Pope Benedict XVI. In the last few years he has made a small gemological lab to study and grade the many gems set in these objects.

Contributions: Inclusion and Gemstone Photographs

Richard D. Armstrong, RGA

Richard grew up in Central Illinois and became interested in picking up rocks found in the local glacial moraine at the age of 9. At the age of 14 he bought a lapidary unit with money from his paper route and taught himself to cut cabochons. In High School he excelled in science earning all the science awards of his graduating class including the Bausch and Lomb Science Award. He planned to study geology and was accepted to the Colorado School of Mines. But because of lack of finances to go to college he enlisted in the Air Force. He served in Vietnam and Thailand during the 1960’s. While in Thailand he worked part-time as a lapidary instructor at the base Lapidary Hobby Shop, in addition to a 60 plus hour work week as an air operations NCO with a Special Operations unit. During the 1960’s he took the GIA courses and took the 20 stone final exam twice missing one stone each time. In 1970 the Air Force sent him to Florida State University for a degree in management. While there he minored in geology taking 12 quarter hours of mineralogy. After receiving his BS degree from FSU he was commissioned a 2nd Lieutenant and served as an Air Traffic Control Officer. He left the Air Force after 15 years of active duty with a Masters of Business Administration. In 1984 he completed a Masters of Accountancy degree from New Mexico State University. He then became a CPA and worked for 16 years as an Auditor with the U. S. Army Audit Agency. He retired from Federal Civil Service in 2002 with a total of 32 years of government service and retired from the Air Force Reserve in 2003.

Although his career was in management and accounting, his lifelong passion is gems and minerals. After his wife passed away in 2009 Richard decided to do something with that passion so enrolled in the Registered Gemologist Appraiser program with the International School of Gemology. He completed the program in January 2011 receiving his RGA diploma. Richard previously had two articles published by the Lapidary Journal in the early 70’s: “A Study of Asterism in Quartz”, Nov. 1971; and “The Story of Lake Lucero”, Sep. 1976. Besides gemology and mineralogy Richards interests include astronomy, photography, gardening, bee keeping, and dogs (he showed dogs for about 10 years). His future plans include learning jewelry making and faceting of gemstones, and getting back into lapidary. He is working to establish his gemology and jewelry business. He is a member of the East Texas Gem and Mineral Society and the International Gem Society.

Contributions: Gemstone Photographs and Magnetic Response Data

Olivier Louy, M.Sc., A.G.

Olivier is running from 2009 the "Laboratorio Gemologico Suizomex" in Mexico City. Like many gemologists, he likes the world inside the natural or synthetic gems: "It is always a challenge to catch those inclusions but it is cool to share them as they are so important in gemology especially for the students".

Starting his professional life in 1979 with a Swiss diploma in watch making he was working for Piaget, Baume & Mercier and other famous jewelry watch makers in Geneva. From then, he has fallen in love with beautiful mechanics and high quality jewelry.

Now, he's holding a Master of Science in Earth Science from Montreal University and a Diploma of Accredited Gemologist with Highest Honors from the Asian Institute of Gemological Science. On the side, Olivier is dealing with gemstones and pearls from 2000 and regularly traveling to Bangkok and Chanthaburi for business.

Contributions: Inclusion and Gemstone Photographs

Wilford Bickel

Wilford has a degree in Textile Chemistry from the school of Engineering at Auburn University. He is an accomplished and award winner in mixed media art shows with his wood turning. A few years back he had to take early retirement due to health reasons and started spending more time with his wood turning hobby. It was during this time that he started developing a line of jewelry and was looking for something to make his jewelry different and special. With his chemistry background he soon developed an interest in gemstones for this use and over the last few years he has developed a real love for the gemstones as he has for exotic woods. With his chemistry background the use of the gemology identification instruments and the use of digital microscopy closely relates to his 25 years as Lab Director for a specialty chemical manufacturer.

Contributions: Inclusion and Gemstone Photographs

Pat Wise, Gary Lowe

Contributions: Programming