QCB Jewelers, in the heart of Uptown Whittier, is a family-owned premier destination for custom jewelry, custom design, expert repairs, appraisal and laboratory services with 47 years of manufacturing, wholesale and retail experience. Operating alongside American Gemological Appraisals and Gem Lab (AGA), a NAJA accredited Gem Lab with staff Certified Master Appraisers serves as one of the region’s most advanced appraisal and high-tech lab for jewelry and watch appraisals, diamond and gemstone identification and origin.

Led by Craig Sperling and Guillermo Oliva, our team brings over 65 years of combined field experience to the bench and the laboratory.

Our Family

• Craig Sperling: (CMA, RGA, GCA, CPS, CSMP).
• Guillermo Oliva: (GD, RGA, GCA, CPS).
• Jaime Jimenez: (BA, CSP),
• Angel Ponce: (MA),
• Jeremiah Holiness: (BS, CSP),
• Our Master Craftsmen: Aura (CAD), Hovig (Hand Engraving & Polishing) Jiro (Setting & Finishing), Vartan, Harut and staff (Repairs and Laser Welding). 
• Chip: Our most loved pet and friendly greeter.

Casting Services provided by: Artistry of Gold, Park Avenue Casting and Ermer Casting.

We are a NAJA Accredited Advanced Gemological Laboratory Our lab is equipped with state-of-the-art technology, including:

• Spectroscopy: Raman 532, Photoluminescence (PL), and UV-Vis-NIR analysis.
• Verification: Expert identification of natural vs. synthetic stones (including CVD and HPHT lab-grown diamonds).
• Appraisals: Insurance, estate, probate, dissolution, donation and fair market value appraisals strictly compliant with 2026-2027 USPAP and NAJA standards.

All work is performed by master craftsmen.

• Laser welding and structural restoration.
• Prong re-tipping, replacement and ring resizing.
• Expert pearl re-stringing and cleaning.

• A+ Rated with the Better Business Bureau (BBB), Charter Member BCA - Business Consumer Alliance, Trust Link, Whittier Chamber of Commerce, CA DOJ License 1976-1009, AML & Patriot Act Certified, 
• Member: National Association of Jewelry Appraisers (NAJA), Jewelers of America (JA), Jewelers Vigilance Committee (JVC), American Gem Trade Association (AGTA), Manuscript Society, American Numismatic Association (ANA), NGC Collectors Society, Professional Coin Grading Service (PCGS), 
• Voted: "Best of Whittier" Jewelry Store.

• CMA (Certified Master Appraiser): The highest valuation credential from NAJA, ensuring full USPAP compliance for all legal, IRS, and estate documents.
• RGA (Registered Gemologist Appraiser): The scientific cornerstone, providing expert laboratory identification of natural, synthetic, and treated gemstones.
• GCA (Global Claims Associates): A specialized forensic designation for insurance claims, damage evaluations, and expert witness testimony.
• Certified Pearl Specialist (CPAA): A deep-dive mastery of organic gems, covering the identification and grading of all cultured and natural pearl varieties.
• NAJA Accredited Gemological Laboratory: A formally recognized facility equipped with advanced instrumentation for forensic-level gem testing and identification.
• Member, Jewelry Appraisers of the World (JAW): An association of the world's top independent appraisers. Membership signifies that all credentials and laboratory standards have been independently verified for integrity and accuracy.