Charles I. Carmona

Contact Guild Labs

International jewelry Exchange Building, Los Angeles
International Jewelry Center
550 S. Hill, Los Angeles, CA

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

Phone: 213.624.0137
Fax: 213.624.2114

charles(at) *

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.

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  • From Union Station (train) in downtown Los Angeles, take the Red Line to the Pershing Square Station.
  • For bus routes, go to
  • From Burbank (BUR) airport, 16 miles
  • From Los Angeles (LAX) airport, 18 miles
  • From Long Beach (LGB) airport, 25 miles
  • From Orange County (SNA) airport, 40 miles
  • From Ontario (ONT) airport, 40 miles

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Gemstone Weight Estimation

Gemstone Weight Estimation Handbook

This thoroughly comprehensive manual does the difficult task of estimating carat weights of mounted gemstones, calculated by their dimensions and shape, with over 300 pages of tables listed, and gemstone type.

Read more



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(213) 624 - 0137