Emerald Treatments: Oiling, Resin, and What Disclosure Means
Nearly all commercial emeralds are treated. We explain what treatments are acceptable, how they affect value, and how to disclose them.
Sapphire Origins: Sri Lanka vs. Kashmir vs. Madagascar Compared
Geographic origin dramatically affects sapphire value. Here is what you need to know about the three most sought-after sources.
How to Evaluate Ruby Quality: The Four Cs Applied to Corundum
Understanding color saturation, clarity grades, cut quality, and carat weight is essential when buying rubies at any price point.