![]() Strong acid-based cleaners are a strict no-no as they may etch the marble surface. Mild soap should be used for routine cleaning. Since onyx is a soft, fragile and porous stone material, it requires periodic maintenance and sealing. The bespoke stone material imparts a three dimensional look while its golden glow infuses a touch of glamour into any space. This stone is comforting in grief and helps us process trauma. Gemstone jewelry settings, metals, tools, cutting & faceting stones. A purple gemstone such as amethyst promotes inner peace. Science, tools, identification, treatment, valuation & grading of gems. Find value guidelines, scientific data, expert comments, and more in our Gemstone Listings.
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