Trusted Expertise Since 1983
Independent appraisal and advisory for exceptional jewelry, diamonds, gemstones, watches, estates, and private collections.
Trusted By
Private ClientsEstatesCollectorsInstitutionsFamily OfficesGovernment Agencies
Limited Private Client Offer
Receive complimentary ½ carat lab diamond studs when you enroll as a GSBH Private Client member.
Available with qualifying paid services. One pair per household. While supplies last. GSBH verification does not constitute a formal grading report or insurance appraisal unless separately issued.
From valuation and authentication to strategic guidance and bespoke design,
our services are tailored to the needs of collectors who expect excellence.
Multi-Piece Appraisal
COLLECTIONS
Jewelry Repair & Restoration
CARE
Secure Storage
INSURED
Global Market Advisory
MARKET INTELLIGENCE
Acquisition Advisory
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Advisory & Review Services
GSBH helps clients understand the documentation, condition, valuation context, and market positioning of gemstones, jewelry, diamonds, gold, precious metals, and private collections before major decisions. Whether preparing for insurance, estate planning, resale consideration, acquisition review, custody, or transfer, our role is to provide independent review and advisory clarity.
Understand documentation, condition, valuation context, and market readiness before making a resale decision.
Receive independent review and guidance before acquiring gemstones, jewelry, diamonds, gold, or precious metals.
Prepare documentation and item records before custody, inheritance, institutional review, or private transfer.
Organize inherited jewelry, private collections, and precious assets with professional documentation and review.
Support higher-level review, documentation, and transaction-readiness discussions for qualified institutional or international matters.
Debbie C.'s Discovery
When Debbie C. walked through our doors, she expected a straightforward appraisal of a few diamonds she'd had for years—worth maybe $100, she thought. She needed the assessment urgently. Her husband had recently fallen ill, and clarity on their assets felt important during an uncertain time. But during the consultation, she casually mentioned a small box of older family jewelry, tucked away in a drawer and largely forgotten. What began as a routine review became something extraordinary.
Among the pieces was an imperial jade ring—elegant, understated, the kind of treasure that quietly waits in silence. When our specialists examined it, they realized what had been overlooked all those years: this was a significant piece, valued at approximately $200,000. Debbie's assumption of costume jewelry turned into a discovery of genuine legacy.
We visited her home to document the pieces properly. Sitting in her living room, surrounded by generations of family memory, Debbie shared the story of where the ring had come from. Her grandmother had worn it decades ago. It had passed through hands quietly, without ceremony, the way truly meaningful things often do. As we photographed it under proper lighting, the jade revealed its true color—a rich, translucent green that no casual glance in a drawer could ever capture.
It wasn't just about the dollars revealed. It was about understanding what her family had been holding onto all along—and why.
What She Thought
$100
What It Was Really Worth
$200,000
A proper private review does more than assign value. It can clarify what a family has been preserving all along.
"The most important item in a collection is not always the one brought to the front of the table. It is the one that has been sitting quietly in the family for years."
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Schedule a private consultation and get the clarity and confidence you deserve.