California Office Network
Our Locations
Private consultations across twelve California offices — each offering the same standard of expertise and discretion.
12
Offices
40+
Years
GIA
Certified
Global Reach
Global Centers of Gemological Activity
Important gemstones and jewelry rarely live in only one place. They are acquired in one market, inherited in another, evaluated in a third, and eventually sold, pledged, or restructured somewhere else. Our work reflects that reality.
We support private owners, families, estate representatives, and advisors with services tailored to the needs that matter most in each region.
Private Collector Advisory
Estate review, inheritance valuation, private collector advisory, and discreet sale or hold guidance.
Auction Strategy
Auction readiness, estate-market positioning, provenance presentation, and secondary-market strategy.
Provenance Review
Provenance-sensitive review, source-region context, and origin-driven valuation support.
Rare Colored Stones
Rare colored-stone evaluation, especially Paraíba tourmaline and other origin-sensitive collector material.
Wealth Documentation
Private wealth documentation, custody-aware advisory, and valuation reporting for sophisticated holdings.
Cross-Border Advisory
Cross-border pricing guidance, collector-market positioning, and intergenerational wealth-transfer support.
Diamond & Estate Advisory
Natural-diamond advisory, estate planning support, and valuation clarity for family-held jewelry assets.
Manufacturing-Aware Valuation
Manufacturing-aware valuation, cut interpretation, and global market positioning for polished stones.
Private Transaction Advisory
Private transaction advisory, cross-border movement strategy, and diamond and gold market support.
Treatment Analysis
Treatment-aware ruby and sapphire review, origin analysis, and colored-stone trade interpretation.
Inquiry
International Advisory & Consultations
GSBH regularly works with international clients and partners managing rare gemstone assets.
Remote consultations and documentation services are available for qualified clients worldwide.
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