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  2. Diamond clarity - Wikipedia

    en.wikipedia.org/wiki/Diamond_clarity

    Diamond clarity is the quality of diamonds that relates to the existence and visual appearance of internal characteristics of a diamond called inclusions, and surface defects, called blemishes. Clarity is one of the four Cs of diamond grading, the others being carat, color, and cut . Inclusions are solids, liquids, or gases that were trapped in ...

  3. RIAA certification - Wikipedia

    en.wikipedia.org/wiki/RIAA_certification

    RIAA certification. In the United States, the Recording Industry Association of America (RIAA) operates an awards program based on the certified number of albums and singles sold through retail and other ancillary markets. [ 1] Other countries have similar awards (see music recording certification ). Certification is not automatic; for an award ...

  4. NFPA 704 - Wikipedia

    en.wikipedia.org/wiki/NFPA_704

    NFPA 704 safety squares on containers of ethyl alcohol and acetone. " NFPA 704: Standard System for the Identification of the Hazards of Materials for Emergency Response " is a standard maintained by the U.S. -based National Fire Protection Association. First "tentatively adopted as a guide" in 1960, [1] and revised several times since then, it ...

  5. Diamond (gemstone) - Wikipedia

    en.wikipedia.org/wiki/Diamond_(gemstone)

    Diamonds become increasingly rare when considering higher clarity gradings. Only about 20% of all diamonds mined have a clarity rating high enough for the diamond to be considered appropriate for use as a gemstone; the other 80% are relegated to industrial use. Of that top 20%, a significant portion contains one or more visible inclusions.

  6. Music recording certification - Wikipedia

    en.wikipedia.org/wiki/Music_recording_certification

    Music recording certification. A wall of Gold and Platinum records on display at Country Music Hall of Fame and Museum. Music recording certification is a system of certifying that a music recording has shipped, sold, or streamed a certain number of units. The threshold quantity varies by type (such as album, single, music video) and by nation ...

  7. Gemological Institute of America - Wikipedia

    en.wikipedia.org/wiki/Gemological_Institute_of...

    Website. www .gia .edu. The Gemological Institute of America ( GIA) is a nonprofit institute based in Carlsbad, California. It is dedicated to research and education in the field of gemology and the jewelry arts. [1] Founded in 1931, GIA's mission is to protect buyers and sellers of gemstones by setting and maintaining the standards used to ...

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