The rainbow in an opal, the jardin of an emerald, the shimmering asterisk in a star sapphire—learn why gemologists call these "phenomena" or "inclusions" instead of "flaws."

Agate gemstones, especially fossil agate with its visible ties to the past in the form of fossilized life inside, have a deep connection to the Earth.

Fossil coral is a natural gemstone created when prehistoric coral is gradually "agatized." It stands to reason, according to metaphysical beliefs, fossil coral can help bring about change.