guildlabs guild

About Guild

About us

GUILD Gem Lab,based in Los Angeles  America , was established by the renowned American gemologist Mr. Charles Carmona in 1980. GUILD lab owns rich experience, refined data base, and profound academic research background in terms of gemstone identification, grading and geographic origin determination .

GUILD labs now can be found in Los Angeles , HongKong, and Shenzhen, with Mr. Charles Carmona and many senior gemologists in the business as members of the technical team.

Color Grading and Origin Determination

Since 1980, the lab focuses on testing colored gemstones, especially  enhancement treatment, color grading and origin  determination of emerald, ruby and sapphire.  

Trusted and Accurate

The principle of GUILD lab is “providing customers with professional and trustworthy services”, to ensure the integrity, trust and accuracy of gem testing.

highly efficient

By applying highly efficient work procedures and ensuring the premium of testing,it normally takes 7 workdays to finish the job,which save much valuable time for our customers,compared with the general testing duration of 1~2 months.

 

Know your gems from GUILD.

Timeline


Open for business in July of 1980, Guild was early on part of the newly developing downtown Los Angeles gemstone and jewelry district.  This location took advantage of both the concentration of jewelry-related companies for their business needs and their potential value as a source of market pricing for appraisals.

Guild began early on marketing its services to the trade and public at local gem and jewelry shows by taking booths for promotional purposes, identifying gems on-site and meeting future clientele.

Guild first exhibited nationally with its own booth at the AGTA Tucson Gem Fair in 1981, and has done so every year since then.  

Guild attended its first international laboratory gathering hosted by the Gemmological Association of Great Britain in March of 1983, and its second international laboratory gathering hosted by AIGS in Bangkok, Thailand later in 1983.  Other venues over the years for the various international laboratory groups have included Tucson, Arizona and Basel, Switzerland.

Guild President Charles Carmona published the pamphlet-sized  Weight Tables for Calibre Cut Gemstones in 1984, as precursor to its later book on the same topic.

Guild became a member of and attended the first International Colored Stone Association (ICA) Congress in        Idar-Oberstein, Germany in 1985.  Guild then attended the next five consecutive ICA Congresses, in Bangkok, Thailand in 1987, in Colombo, Sri Lanka in 1989, in Tel Aviv, Israel in 1991, and in Hawaii, USA in 1993.  Guild was also represented at the ICA Congress in Bangkok, Thailand in 2005 and in Changha, China in 2013.
Represented by President Charles Carmona, Guild presented a poster at the second GIA International Gemological Symposium, 1991, entitled “Endangered Species Used in  Jewelry – The Tide is Turning”.  Posters were presented at the next three consecutive GIA Symposia (1999, 2006, 2011) on similar topics.
Guild began attending international gem and jewelry shows (Mexico, Switzerland, Hong Kong) in 1995.
Following on the earlier Weight Tables pamphlet, Guild published The Complete Handbook for Gemstone Weight Estimation in 1998.  Currently it is in its fourth printing, with an updated second edition due out in 2017.
Guild was retained for its first international consulting assignment in Cairo, Egypt in 1999.  Later international consulting assignments took place in Wuhan, China (2005), Beijing, China (2006), Ho Chi Minh City, Vietnam (2006) and Puerto Vallarta, Mexico (2006).
Guild began a series of leading tours to gemstone mining countries in the year 2000, eight trips in total, to Brazil, Germany, Thailand, Sri Lanka and Madagascar.  These were marketed through associations such as the Los Angeles Natural History Museum, the Gemological Institute of America Alumni Association and the Gemmological Association of Great Britain.  
Guild President Charles Carmona was featured in GIA Education Catalog as an example of a successful gemologist/appraiser from 2002 to 2005.
After many local and national television interviews, Guild President Charles Carmona’s first international television program was for the Korean Broadcasting System (2002), followed by Phoenix TV – Hong Kong (2004) and RTA (Madagascar) in 2006.
Guild was awarded the contract by the World Bank as its gemological consultant to establish a gemstone testing laboratory at the     Ecole de Gemologie de Madagascar, (Madagascar Gemology School) in 2006 – 2007.  This assignment involved three trips to Madagascar.
Guild was hired by the Fashion Institute of Design and Merchandising (FIDM) in Los Angeles in 2008 to develop a gemology course as part of its accredited Associate in Arts degree program.  The first semester of the program was taught by Guild President Charles Carmona.
The domain name www.guildlabs.com was registered in 2008.
The World Bank again awarded the contract to Guild as a consultant to establish the Tanzania Gemological Centre in 2013 – 2015.  This assignment involved seven trips to Tanzania in East Africa.
Guild President Charles Carmona was the principal gemologist and on-screen talent for Sharing the Rough, a feature-length film about the journey of a rough gemstone from out of the ground through the steps into a piece of jewelry, filmed in Tanzania in 2014 and finished and shown in the US and Canada in 2015. 
Guild President Charles Carmona was elected to the Board of Directors of the American Gem Trade Association (AGTA) in 2015.  He also has served on many boards of local associations over the last 35 years.
Guild Gem Lab is established in Hong Kong and Shenzhen, China in 2016.

The Experts

CHARLES CARMONA, GG ASA

 

Guild Laboratories president and gemologist Charles Carmona has been a rock-hound and coin collector since the 1960s; eventually turning this passion into a gem and jewelry business. During the 1970s he was an importer of colored gemstones from Asia and South America.  He established Guild Laboratories in 1980.

High school (mid-1960’s) – rock/mineral/fossil, medal winning display at county fair.  Also coins and currency collector.

After employment in South America in oil business, began importing emeralds from Colombia and selling them to jewelers in southern California (from 1977)

Graduate Gemologist diploma from GIA in Santa Monica, California (1978).  Continued importing emeralds from Colombia.

Attended 1st Tucson Gem Show in 1979, and everyone since then.

Started gem testing laboratory and appraisal business in 1980 in West Los Angeles.  Moved business to downtown Los Angeles jewelry district in 1982.

Exhibitor at AGTA Tucson Gem Show every year since 1981. 

Attended 1st international laboratory gathering hosted by Gemmological Association of Great Britain - 1982

1st interview as expert on national television in 1982.

Attended 2nd international laboratory gathering hosted by AIGS in Bangkok, Thailand - 1983

Accredited Member (AM) of the American Society of Appraisers in 1983.  Principles of Valuation Program       Lindenwood College, Missouri

Indiana University School of Continuing Studies, Certified Appraiser of Personal Property Program

1st assignment as expert in court in 1984.

Published Weight Tables for Calibre Cut Gemstones in 1984.

Charter member of the Gem & Mineral Council of the Natural History Museum of Los Angeles in 1985.  President of Council 2004 – 2006.

Attended first International Colored Stone Association (ICA) Congress, Idar-Oberstein, Germany - 1985

Senior Accredited Appraiser (ASA) of the American Society of Appraisers in 1986 – President of Los Angeles Chapter 1993 – 1994.

Attended ICA Congress in Bangkok, Thailand in 1987.

Attended ICA Congress in Colombo, Sri Lanka in 1989.

Attended ICA Congress in Tel Aviv, Israel in 1991.

Attended ICA Congress in Hawaii, USA in 1993.

Poster Session at GIA International Gemological Symposium, 1991, “Endangered Species Used in  Jewelry – The Tide is Turning”.

President of GIA Alumni Association Los Angeles chapter, 1995 - 1996

Published The Complete Handbook for Gemstone Weight Estimation in 1998.

Poster Session at GIA International Gemological Symposium, 1999, “Current Status of Products of Endangered and Threatened Species Used in Jewelry”.

1st international consulting assignment – jewelry appraisal in Cairo, Egypt, 1999

Led 1st gemstone mining trip to Brazil through the Natural History Museum travel program – 2000

Led 2nd gemstone mining trip to Brazil through the Natural History Museum travel program – 2001

Led gemstone industry trip to Idar-Oberstein, Germany through the Natural History Museum travel program – 2002

Featured in GIA Education Catalog as an example of a successful gemologist/appraiser 2002 – 2005.

First international television program (Korean Broadcasting System) in 2002.

Led 1st gemstone mining trip to Thailand through the GIA Alumni Association travel program – 2003

Phoenix TV (Hong Kong) interview in 2004.

Mineral appraisal assignment in Wuhan, China – 2005

Led 2st gemstone mining trip to Thailand through the Natural History Museum travel program – 2005

Led 3rd gemstone mining trip to Brazil through the Gemmological Association of Great Britain travel  program – 2005

Led 1st gemstone mining trip to Sri Lanka through the Natural History Museum travel program – 2006

Jewelry appraisal assignment in Beijing, China in 2006.

Poster session at GIA International Gemological Symposium, 2006, “Products of Endangered Species Used in Jewelry – Pulling Back from Extinction”

Consulting assignment in Ho Chi Minh City, Vietnam in 2006.

Consulting assignment in Puerto Vallarta, Mexico in 2006.

World Bank consultant to establish gemstone testing laboratory at the Ecole de Gemologie de Madagascar, 2006 – 2007.  Three trips to Madagascar.

GIA Alumni Association Los Angeles chapter board member – 2007 to present

 Led 1st gemstone mining trip to Madagascar through the Natural History Museum travel program – 2008

Developer of and instructor for gemology course at the Fashion Institute of Design and Merchandising (FIDM) in Los Angeles, 2008.

Registration of www.guildlabs.com in 2008.

Poster Session at GIA International Gemological Symposium, 2011, “Too Precious to Wear – Alternatives to Coral Used in Jewelry”.

World Bank consultant to establish the Tanzania Gemological Centre, 2013 – 2015.  Seven trips to Tanzania.

Attended ICA Congress in Changsha, China in 2013.

Principal geologist/gemologist and on-screen talent for Sharing the Rough, a feature-length film about the journey of a rough gemstone from out of the ground through the steps into a piece of jewelry, shot in Tanzania in 2014 and finished and shown in the US and Canada in 2015.

Elected to the Board of Directors of the American Gem Trade Association (AGTA) in 2015.

Contact us

Guild Labs
550 S. Hill, Suite #1188
Los Angeles, CA 90013

Phone: 213.624.0137 
Toll Free: 800.909.4845
Fax: 213.624.2114

Email:cicarmona(at)aol.com *

Located in the downtown Los Angeles jewelry district on the northeast corner of 6th & Hill Sts., Guild Labs is freeway close to all of southern California.

© GUILD GEM LABORATORIES