Our Services
Comprehensive numismatic services backed by expertise, technology, and unwavering standards.
Coin Grading
Our expert numismatists grade every coin on the internationally recognized Sheldon 1-70 scale. Using structured grading inputs that evaluate strike quality, surface preservation, luster, and eye appeal, we deliver objective and consistent grades you can trust.
- Sheldon 1-70 numerical grading scale
- Structured grading inputs for objectivity
- Multi-level quality control review
- Detailed grade labels (e.g., MS-65, PF-67)
- Designation assignments (MS, PF, SP)
- Encapsulation in tamper-evident holders
- Unique certification number for every coin
- Online verification and population data
Authentication
Every coin submitted to IGA undergoes rigorous authentication before grading. Our team uses advanced diagnostic tools, die analysis, metallurgical testing, and decades of expertise to verify that your coin is genuine and unaltered.
- Expert visual examination under magnification
- Weight and dimensional verification
- Die variety identification
- Detection of tooling, added mintmarks, and alterations
- Surface analysis for artificial toning or cleaning
- Counterfeit detection using reference databases
- Certification of authenticity with every graded coin
- Standalone authentication service available
Conservation
IGA offers professional conservation services designed to stabilize and preserve your coins without altering their original character. Our conservators use proven, non-invasive techniques that meet the highest museum standards.
- Removal of surface contaminants and PVC residue
- Stabilization of active corrosion
- Non-invasive cleaning techniques
- Preservation of original patina and toning
- No artificial enhancement or re-coloring
- Detailed conservation report provided
- Optional re-grading after conservation
- Archival-quality encapsulation