At Abbott & Oaks, authenticity is not assumed — it is proven. Every piece undergoes a rigorous, multi-step evaluation based on GIA (Gemological Institute of America) standards. Our process combines traditional expertise with advanced gemological tools to ensure you receive a piece you can trust.

1. Precious Metal Verification We test all gold and platinum materials through a two-step method:

• Acid Testing: A proven field test to verify karat purity.
• Electronic & Advanced Testing: For select pieces, we use precision tools to confirm metal content.
• Hallmark & Construction Review: We closely inspect stamps, soldering methods, and fabrication details consistent with period craftsmanship.

2. Gemstone Evaluation Each gemstone is carefully examined to verify identity, quality, and authenticity:

• Microscopic Inspection: We use gemological microscopes to evaluate inclusions, growth structures, and treatments.
• Refractometer Testing: Refractive index readings help confirm gemstone species.
• Chelsea Filter Analysis: To detect treatments and synthetics, especially in rubies, emeralds, and sapphires.
• UV Fluorescence Testing: Ultraviolet light reveals diagnostic fluorescence patterns unique to certain gemstones.

3. Structural & Craftsmanship Assessment Authenticity goes beyond materials:

• Hand-Crafted vs. Machine-Made Analysis: We study fabrication techniques, hallmark styles, and design motifs to ensure consistency with the claimed period.
• Wear Patterns: Genuine vintage pieces exhibit characteristic wear that modern replicas cannot easily replicate.

4. Advanced Testing Methods For select cases where further confirmation is needed, we employ:

• Specific Gravity Testing: To differentiate natural from synthetic stones.
• External Laboratory Verification: For high-value items, we may submit pieces to trusted third-party labs for XRF (X-ray fluorescence) or other advanced analysis.

5. Continuous Standards We continuously refine our standards to keep pace with advancements in gemology and metallurgy. Our mission is to preserve the integrity of every piece we offer.

Authenticity is our promise — and our practice.