Gemological examination of a diamond ringFine jewelry craftsmanship under close examinationEmerald necklace with provenance documentationFancy yellow diamonds and ring

Empowering Jewelry Owners Since 1983

Know What Your JewelryIs Truly Worth.

Independent appraisal and advisory for exceptional jewelry, diamonds, gemstones, watches, estates, and private collections.

By appointment only · Insured custody · 12 locations across Southern California

Trusted By

Private ClientsEstatesCollectorsInstitutionsFamily OfficesGovernment Agencies

Trusted Authority

Clients We Serve

BlackRock

BlackRock

GIA

GIA

Diamond Dealers Club NY

Diamond Dealers Club NY

Hong Kong Trade Development Council

Hong Kong Trade Development Council

State Farm

State Farm

Deloitte & Touche

Deloitte & Touche

Neiman Marcus

Neiman Marcus

Harry Winston

Harry Winston

Cartier

Cartier

US Mission African Union

US Mission African Union

BlackRock

BlackRock

GIA

GIA

Diamond Dealers Club NY

Diamond Dealers Club NY

Hong Kong Trade Development Council

Hong Kong Trade Development Council

State Farm

State Farm

Deloitte & Touche

Deloitte & Touche

Neiman Marcus

Neiman Marcus

Harry Winston

Harry Winston

Cartier

Cartier

US Mission African Union

US Mission African Union

BlackRock

BlackRock

GIA

GIA

Diamond Dealers Club NY

Diamond Dealers Club NY

Hong Kong Trade Development Council

Hong Kong Trade Development Council

State Farm

State Farm

Deloitte & Touche

Deloitte & Touche

Neiman Marcus

Neiman Marcus

Harry Winston

Harry Winston

Cartier

Cartier

US Mission African Union

US Mission African Union

Not sure where to begin?

We'll help you choose the right path

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 appraisal

Bring 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 review

Yes. We document value for your insurer and advise on selling, so every decision is made with confidence.

Speak with a specialist

Yes. Enter the report number in our Report Lookup to confirm its authenticity instantly.

Look up a report
Explore everything we can do
A GSBH specialist reviewing a client’s jewelry inside the private vault

Clarity by GSBH Members Only

Protect whatmatters most.

A private membership for the jewelry you treasure. Each piece is examined and documented by a GSBH gemologist, held in our secured Beverly Hills vault, and recorded with its history, condition and value, so its story is preserved and passed on with confidence to the generations ahead.

  • 24/7 digital and physical security
  • Biometric protection at our locations
  • Available in Beverly Hills
  • Waitlist and approval only

Limited membership · By invitation

Global Market Presence

One Standard,
Six Global Markets

From Beverly Hills to the world's leading gemstone centers, GSBH serves clients in the six most important gemstone trading, sourcing, and auction markets. Wherever you are, our specialists are close by, and international clients are always welcome.

Choose a market

Spin the globe, then tap a region

Headquarters & offices

United States

Beverly Hills · New York · Las Vegas · Miami

Our Beverly Hills headquarters sits at the centre of West Coast private collecting, estate settlements and pre-sale auction review. Activity at Sotheby's, Christie's and Bonhams New York keeps demand steady for independent authentication and appraisal.

Our expertise here

  • Private Collector Appraisal
  • Estate Documentation
  • Auction Advisory
  • Insurance Valuation
Discuss this market

Advisory & Review Services

Advisory Support Before a Purchase, Sale, or Transfer

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.

Before You Sell

Understand documentation, condition, valuation context, and market readiness before making a resale decision.

Before You Buy

Receive independent review and guidance before acquiring gemstones, jewelry, diamonds, gold, or precious metals.

Before You Transfer

Prepare documentation and item records before custody, inheritance, institutional review, or private transfer.

For Estates & Collections

Organize inherited jewelry, private collections, and precious assets with professional documentation and review.

For Institutions & Counterparties

Support higher-level review, documentation, and transaction-readiness discussions for qualified institutional or international matters.

“

Gemstones are the oldest citizens of our planet. Born in darkness deep within the earth's crust, they were formed under unimaginable pressure and heat conditions that only nature itself could orchestrate.

Z Boyadjian

Z Boyadjian

CEO & International Gemological Advisor

Private Client Case Study

A Discovery That Supported Her Family When They Needed It Most

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.

Book Consultation Learn More
Imperial jade ring detail
Hand wearing imperial jade ring

"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."

Research & News

Latest Publications

Recent announcements, research publications, and institutional developments.

April 2026
Business Advisory
★ Featured

Authenticity and Trust in Business: Why Expertise Matters in Jewelry Appraisal

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.

April 2026
Advisory
★ Featured

Authenticity and Trust in Business

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.

April 2026
Research
★ Featured

The Art of Provenance

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.

April 2026
Research
★ Featured

The Value of Provenance

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.

March 2026
Market Intelligence
★ Featured

Why Diamonds and Gemstones Matter in a Volatile Market

In periods marked by geopolitical tension, uneven liquidity, and renewed scrutiny of traditional financial institutions, tangible hard assets are re-entering serious conversation.

November 2026
Market Intelligence

Gold Holds the $4,000 Line: What It Means for Jewelry Owners and Estates

As analysts split between consolidation toward $3,900 and a year-end rally to $4,650, gold-heavy collections may be carrying outdated values.

February 2026
Research

Kashmir Sapphires and the New Standard of Selectivity

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.

January 2026
Advisory

Colombian Emeralds, Documentation, and the Modern Collector

In the emerald market, origin confidence, treatment disclosure, and supporting documentation increasingly travel together with value.

December 2025
Institutional

Why Hard Assets Are Re-entering the Conversation

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.

Ready for Expert Guidance?

Schedule a private consultation and get the clarity and confidence you deserve.

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