Charles I. Carmona

Legal Trade

Expert Witness

Noted gemologist, appraiser and author Charles Carmona has extensive experience consulting for attorneys and has testified in numerous regional and national legal matters. He is frequently retained to provide advice in legal proceedings requiring specialized knowledge of industry practices and the valuation of jewelry, diamonds, gemstones, coins and currency, silver and related personal property.

An expert valuation specialist, Mr. Carmona's contributions are key to determining financial damages in complex litigation, criminal matters, insurance claims, class actions and other disputes.


Mr. Carmona is a Graduate Gemologist (GG) from Gemological Institute of America (GIA) with over 35 years of experience. He is also an Accredited Senior Appraiser (ASA) and past president of the southern California Chapter of the American Society of Appraisers.

His highly acclaimed reference book, The Complete Handbook for Gemstone Weight Estimation is relied upon worldwide by jewelry professionals as the authoritative source for estimating mounted gemstone weights by shape, dimension and specific gravity.

His professional opinions are frequently sought out by the media, and he's an oft invited speaker at special events, museum groups, at workshops and trade shows.


Mr. Carmona has earned an exemplary reputation as an impartial expert witness, assisting both plaintiffs and defendants.

He offers consultation and appraisal services for museums, accountants, and insurance companies, governmental and non-governmental agencies, including The World Bank, Department of Homeland Security, IRS and Securities & Exchange Commission, among numerous others.

Clear and Persuasive Testimony

Mr. Carmona thoroughly understands the trial process and how to anticipate a line of questioning during cross examination.

He exhibits acute awareness of nonverbal cues like facial expressions, gestures, posture and eye contact, and how they contribute to juror perception.

He conveys clear, confident and concise testimony that underscores his persuasiveness and effectiveness.


Mr. Carmona delivers critical support to his clients at each stage of a legal dispute, from fact-finding and discovery to settlement or trial. His services include expert witness testimony, reports, critiques of opposing expert opinions, and consultation during discovery and fact-finding.
His expertise covers the following areas:

  • Accounting & Business Inventory Audits
  • Arbitration & Mediation
  • Commercial Damages
  • Complex Civil Litigation
  • Contractual Disputes
  • Criminal Litigation
  • Damage Estimates
  • Equitable Distribution
  • Fair Market Value (Estates, Gifts, Donations, Casualty Loss)
  • Family Law
  • Financial Investigations
  • Fraud and Mismanagement
  • Immediate & Orderly Liquidation Value
  • Insurance
  • Intellectual Property Disputes
  • Professional Malpractice

Learn more about Mr. Carmona's experience and credentials by calling 213-624-0137 or email:

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
Guild Labs' President and Founder is often featured as an expert appraiser in TV shows,
such as the Travel Channel.

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(213) 624 - 0137