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From emeralds to alexandrite, rare gemstones embody both beauty and legacy. Discover Caram’s guide to ranking gemstones by rarity and value — and learn how collectors identify heirloom gems that endure as both treasures and investments.

Many buyers — and even seasoned dealers — misunderstand what color stability classifications mean, especially the often-misread Type 3a. In reality, a Type 3a Padparadscha sapphire may improve in color when exposed to UV light, making it a hidden advantage rather than a risk. In this article, we break down the GRS types, explain why “discharged” and “charged” states matter, and show how a trusted advisor can help you navigate gemstone reports with confidence.

Insights into the rare gemstone factors that elevate these treasures beyond mere adornment.