Protecting your investment with detailed evaluations that confirm origin, quality, and maker—because every piece deserves the truth of its story.
Our experts meticulously examine hallmarks, engravings, and maker’s signatures to authenticate their origin, age, and legitimacy. These subtle imprints—whether a discreet stamp or a masterful signature—serve as the first layer of a jewel’s identity. Using loupes, microscopes, and historical reference guides, we compare each mark against known archives to ensure it aligns with the techniques and placement expected from the claimed period or maker.
This level of scrutiny is especially essential for signed pieces by iconic houses such as Cartier, Van Cleef & Arpels, or Bulgari, where the precision and integrity of the mark can significantly influence both value and collectability.
We employ advanced techniques to verify the metal content and gemstone authenticity, using non-invasive methods whenever possible. Gold and platinum are tested for purity, while gemstones undergo visual inspection, UV reaction testing, and, when needed, spectroscopic analysis to determine their origin, treatment history, and natural versus synthetic nature.
This ensures that diamonds, rubies, sapphires, and emeralds—whether antique or modern—are accurately identified and classified, forming the foundation of a reliable appraisal and transparent provenance.
A jewel’s history is often as valuable as its materials. Our team conducts in-depth provenance research, tracing ownership, past exhibitions, auction appearances, and historical significance. Where available, we consult with archives, auction house records, and private collectors to reconstruct a piece’s journey through time.
Establishing provenance not only reinforces authenticity—it can elevate the narrative and value of a piece, transforming it from a beautiful object into a story-worthy treasure.
To confirm that a piece aligns with the standards of a specific house, we compare its design, construction, and materials with documented examples from the same brand. This involves reviewing period catalogues, design patents, and authenticated collections, allowing us to assess stylistic and technical consistencies.
This step is particularly important for signed jewelry, where counterfeit pieces may mimic surface aesthetics but fall short in craftsmanship, proportions, or setting techniques. Only when a jewel matches the unmistakable signature of its maker do we affirm its origin.
Our authentication reports are comprehensive documents that detail the findings of each inspection step. These include high-resolution imagery, hallmark analysis, test results, and relevant historical context. We provide a clear conclusion on the authenticity and, where possible, the approximate creation date and maker.
These reports are formatted for clarity and credibility, whether intended for private records, insurance purposes, or resale documentation—offering peace of mind and lasting value.
Once authenticated, we provide market-aware valuations based on the piece’s maker, materials, condition, and comparable sales. Our appraisals are suitable for insurance, estate planning, or resale and reflect current trends and demand within the international fine jewelry market.
Unlike generic appraisals, ours are grounded in expertise and nuance—recognizing the true worth of signed vintage pieces, rare gems, and historically significant designs.
In addition to curation, we offer a discreet and expert-driven acquisition service. Whether you wish to sell a signed jewel, a vintage timepiece, or a rare gemstone, each piece undergoes the same rigorous examination as our gallery inventory.
Our specialists assess provenance, condition, and market relevance, ensuring that each acquisition reflects both historical integrity and current value. This meticulous process allows us to offer fair, transparent pricing — grounded in expertise, not estimation.
To inquire about selling your piece, please visit our buy-back page for details on evaluation and submission.
We believe that true beauty lies not only in craftsmanship, but in origin. Through meticulous research, testing, and expert analysis, we uncover the story behind every jewel—confirming its maker, its materials, and its place in history. Whether verifying a signature or revealing a gemstone’s natural origin, we bring clarity and confidence to every acquisition.
Our authentication process is rooted in precision and deep industry knowledge. Each hallmark, setting, and stone is scrutinized using a combination of traditional expertise and advanced technology. From vintage treasures to signed masterpieces, we ensure that what you hold is not just beautiful—but real.
Our detailed reports accompany every verified piece, offering a complete view of its authenticity, provenance, and value. Whether for collection, insurance, or resale, our documentation brings lasting peace of mind and protects the legacy of each jewel for generations to come.
Beyond curation, we also acquire exceptional pieces — from signed jewels and vintage watches to rare gemstones. Each item offered to us is treated with the same care and scrutiny as those in our gallery: examined for authenticity, historical significance, and market relevance.
From meticulous research to world-class expertise, here’s why collectors, investors, and connoisseurs trust us with the authentication of their most exceptional pieces.
Our specialists combine decades of hands-on experience with in-depth knowledge of historical design, hallmark systems, and brand-specific characteristics, from Cartier and Van Cleef to lesser-known atelier marks.
We utilize cutting-edge gemological tools and non-destructive techniques to analyze metals and gemstones, ensuring both accuracy and preservation of the piece’s integrity.
Through our connections with global auction houses, design archives, and historic brand catalogues, we provide informed assessments rooted in verified documentation and visual comparisons.
Each authentication comes with a detailed report outlining our findings, provenance insights, and valuation context, suitable for insurance, resale, or collection management.
Whether verifying a private heirloom or assessing a high-value acquisition, we operate with complete discretion and a commitment to objective, transparent results.
Our authentication service is priced according to the complexity and rarity of each piece, ensuring you receive meticulous analysis and honest, expert insight. Contact us to discuss your jewelry and receive a personalized quote for a full authentication and documentation service.
Every piece of jewelry carries a history waiting to be uncovered. We don’t just verify authenticity—we preserve the truth behind treasured legacies.
Each hallmark is carefully examined and cross-checked, authenticity at Grygorian Gallery begins with the smallest details.
A maker’s signature is never just decorative, it’s a verified mark of origin, proudly documented by our experts.
Our authentication resources offer in-depth knowledge on hallmarks, signatures, materials, and provenance—empowering you to collect with confidence and clarity.
Understand how we verify each piece, what our process entails, and how we ensure every detail is accounted for.
Our process begins with a detailed visual and technical assessment. From hallmarks and signatures to construction methods and material composition, every element is examined and cross-referenced with archival references and expert databases. When needed, we collaborate with independent laboratories for gemological or metallurgical testing.
We verify signed and unsigned estate jewelry, vintage and contemporary watches, loose gemstones, and high-value collectibles. Items from renowned maisons such as Cartier, Boucheron, and Tiffany & Co. are among those we most frequently assess.
Yes. Upon request, we provide a written summary of findings, including photographs, hallmark documentation, and verification details. This is not an appraisal but a confirmation of authenticity based on expert analysis.
Yes, though the process may require more in-depth research. In such cases, we focus on stylistic traits, construction techniques, provenance, and comparative analysis.
In some cases, yes. We offer preliminary digital assessments for international clients, but final verification typically requires in-person evaluation at one of our locations or through secure shipping.
Yes. In addition to curation and authentication, we offer a discreet acquisition service for signed jewelry, vintage watches, and high-quality gemstones. Each piece is carefully evaluated by our experts for authenticity, condition, and market value. If your item meets our criteria, we will provide a fair market offer based on current demand and historical relevance.
Whether you’re seeking peace of mind or uncovering a piece’s true origins, we’re here to guide you through every step of the authentication process with precision and care.
