Empowering Jewelry Owners Since 1983
Independent appraisal and advisory for exceptional jewelry, diamonds, gemstones, watches, estates, and private collections.
By appointment only · Insured custody · 12 locations across Southern California
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Private ClientsEstatesCollectorsInstitutionsFamily OfficesGovernment AgenciesOur Services
Independent appraisal, authentication, and advisory services for jewelry, gemstones, watches, and significant collections.
Not sure where to begin?
Pick a starting point, or find a quick answer below.
Curious what your pieces could do?
Often more than you expect. A private appraisal shows its true market and insurance value, usually within a single appointment.
Book an appraisalBring it just as it is. We identify each piece, document what it is, and walk you through your options to keep, insure or sell.
Plan a private reviewYes. We document value for your insurer and advise on selling, so every decision is made with confidence.
Speak with a specialistYes. Enter the report number in our Report Lookup to confirm its authenticity instantly.
Look up a reportAdvisory & 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."
Recent announcements, research publications, and institutional developments.
In an age of rapid transactions and global trade, authenticity has become the cornerstone of trust. A major Louvre heist illustrates the profound difference between intrinsic value and provenance value — and why an experienced gemologist matters.
In today's luxury market, authenticity is the cornerstone of trust. Yet in an era of digital transactions, the line between genuine and imitation has grown increasingly blurred. A skilled appraiser must possess technical expertise and deep historical knowledge.
Provenance is one of the most misunderstood aspects of jewelry appraisal. It goes far beyond a name or a story — it is the fingerprint of authenticity that connects a jewel to its time, its maker, and its legacy.
In the jewelry world, provenance is one of the most overlooked elements in determining value. Many appraisers focus only on visible beauty or technical grading, yet provenance — the story and integrity of a piece — is what ultimately defines its worth.
In periods marked by geopolitical tension, uneven liquidity, and renewed scrutiny of traditional financial institutions, tangible hard assets are re-entering serious conversation.
As analysts split between consolidation toward $3,900 and a year-end rally to $4,650, gold-heavy collections may be carrying outdated values.
The highest tier of the Kashmir sapphire market is no longer defined by origin alone, but by the convergence of beauty, treatment status, and documentation quality.
In the emerald market, origin confidence, treatment disclosure, and supporting documentation increasingly travel together with value.
As markets become more visibly repriced and ownership structures more scrutinized, tangible hard assets are being revisited for their discretion, portability, and non-digital character.
Schedule a private consultation and get the clarity and confidence you deserve.
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