Comprehensive Services for Individuals and Industry Professionals

STL Gems offers a full suite of independent gemological services, tailored to meet the needs of clients ranging from jewelry enthusiasts to retail jewelers.

Who We Serve & How We Help

Whether you’re managing an estate, updating insurance records, evaluating a gemstone’s authenticity, or running a jewelry business, STL Gems provides the expertise, transparency, and ethical insight you need. Our concierge approach means you get tailored support — on your terms — with rigorous standards upheld at every step.

Who We Serve & How We Help

Whether you’re managing an estate, updating insurance records, evaluating a gemstone’s authenticity, or running a jewelry business, STL Gems provides the expertise, transparency, and ethical insight you need. Our concierge approach means you get tailored support—on your terms—with rigorous standards upheld at every step.

Core Services

Whether you’re preserving an heirloom, sourcing a rare gemstone, settling an estate, or advising clients in a professional capacity, STL Gems offers integrated services designed to meet the moment.

Core Services

Whether you’re preserving an heirloom, sourcing a rare gemstone, settling an estate, or advising clients in a professional capacity, STL Gems offers integrated services designed to meet the moment.

APPRAISAL SERVICES

We offer fully USPAP-compliant reports for:

Insurance (retail replacement value)
Fair market value (resale, estate division, tax planning)
Legal and probate valuations
Charitable donations & tax-deductible contributions: each report includes detailed documentation, high-resolution photography, and market-based analysis.

Gemological Testing & Reporting

Using advanced, non-destructive methods, we provide:

Stone identification (natural, synthetic, imitation)
Grading and quality analysis
Treatment and enhancement verification
Origin assessment
Lab report consulting and referrals (GIA, AGL, SSEF, etc.)

Estate & Collection Consulting

We help clients evaluate inherited collections, determine next steps, and make informed decisions about:

Sorting and identifying valuable pieces
Selling, consigning, or repurposing items
Legal and tax documentation for estates
Private sales and auction facilitation

Custom Design, Restoration & Repurposing

We offer design guidance and expert insight for:

Heirloom jewelry transformations
Jewelry modifications and restoration
Collaborations with trusted bench jewelers

Consulting & Advisory

Ongoing support for:

Estate planning and asset documentation
Pre-purchase evaluations
Collector education and acquisition guidance
Brokering services

retail jeweler services

Specialized designer support for breakout gemstone collections:

Sorting loose stones into natural, synthetic, and imitation
Identifying value and resale strategy
Recutting or repair recommendations
Revenue optimization through resale, redesign, or brokering

Forensic gemology

Advanced damage analysis for insurers, attorneys, and collectors:

Insurance claim verification
Differentiating natural vs. external damage
Fire, heat, and impact analysis
Gem treatment evaluation
Wear vs. catastrophic damage assessments

live events

Live, interactive experiences that leave an impression:

Gem hunting adventures
Private party engagements
Silent auction support
Gemstone cocktail hours
Live demonstrations

What We Don’t Offer

STL Gems does not buy or sell the items we evaluate. We are strictly independent to maintain objectivity and eliminate conflicts of interest. Our role is to empower, not profit from, your decisions.

What We
Don’t Offer

STL Gems does not buy or sell the items we evaluate. We are strictly independent to maintain objectivity and eliminate conflicts of interest. Our role is to empower, not profit from, your decisions.