Kidney stones are small, hard crystals that form in your urinary tract. But how can something so tiny cause so much pain? Learn more.

Ruby and Sapphire are the 2nd and 3rd most popular colored stones in the United States.

New to gemstones? Curious about the different kinds of gemstones? Check out our gemstones list and discover a world of precious and semi-precious stones.

Gem Encyclopedia is a virtual journey through the science and lore of Gemstones from across the globe. Each Gem page features Gemological Information, a Buyer’s guide, photos, videos & …

Group of precious and semiprecious stones—both uncut and faceted—including (clockwise from top left) diamond, uncut synthetic sapphire, ruby, uncut emerald, and amethyst crystal cluster.

Dec 26, 2025 · Of the more than 2,000 identified natural minerals, fewer than 100 are used as gemstones and only 16 have achieved importance. These are beryl, chrysoberyl, corundum, …

Apr 4, 2025 · Diagnosis Diagnosis involves the steps that your healthcare professional takes to find out if you have kidney stones. Diagnosis also can include testing to find the cause and …

Gemstone List: A Complete Gemstones List with Images. Our gemstone list features over 200 precious and semi-precious varieties, a comprehensive index to find the ideal colored stone. …

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Mar 4, 2025 · Kidney stones can be painful when they pass. Learn about early signs of kidney stones, treatment, and how to prevent them.