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  2. International Gemological Institute - Wikipedia

    en.wikipedia.org/wiki/International_Gemological...

    IGI provides independent grading reports, colored stone reports, identification and appraisal reports, diamond authentication and attestations of origin, and laser inscription services. They also offers diamond and colored stone courses through IGI's Schools of Gemology. [7] Graduates from the IGI school of Gemology are awarded an IGI Diploma.

  3. Gemological Institute of America - Wikipedia

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

    Diamond reports from GIA (as well as other, for-profit sources) are now demanded by most consumers purchasing diamonds over a certain size, typically for over 0.5 carat (100 mg), and almost always for over 1.0 carat (200 mg), and are considered an important tool in guaranteeing that a diamond is accurately represented to a potential buyer.

  4. Diamond color - Wikipedia

    en.wikipedia.org/wiki/Diamond_color

    Color grading of diamonds was performed as a step of sorting rough diamonds for sale by the London Diamond Syndicate. As the diamond trade developed, early diamond grades were introduced. Without any co-operative development, these early grading systems lacked standard nomenclature and consistency. Some early grading scales were; I, II, III; A, AA, AAA; A, B, C. Numerous terms

  5. Darry Ring - Wikipedia

    en.wikipedia.org/wiki/Darry_Ring

    Darry Ring, (colloquially known as DR) is a Chinese jewelry brand headquartered in Shenzhen, China, known for its "One Love, One Lifetime" philosophy.Specializing in engagement rings and wedding rings, as well as other fine jewelry, all its diamonds are certified by authorities such as NGTC, GIA, or IGI.

  6. 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 .

  7. Music recording certification - Wikipedia

    en.wikipedia.org/wiki/Music_recording_certification

    No album was certified platinum prior to this year. The 1958 RCA Victor recording by Van Cliburn of the Tchaikovsky Piano Concerto would eventually be awarded a platinum citation, but this did not occur until two decades after its release. In 1999, the diamond certification was introduced for sales of ten million units. In the late 1980s, the ...

  8. Recycled diamond - Wikipedia

    en.wikipedia.org/wiki/Recycled_diamond

    A diamond laboratory, such as GIA, AGS, EGL USA or IGI, certifies larger diamonds, and these diamonds are sold individually, directly to the public or to jewelry retailers and diamond dealers. [6] According to an independent diamond analyst, the global diamond market saw a huge change in the demand for recycled diamonds.

  9. Diamonds as an investment - Wikipedia

    en.wikipedia.org/wiki/Diamonds_as_an_investment

    In early 2025 diamond prices had dropped significantly from a peak in 2022; prices of natural gems in shops dropped by 26% by the beginning of 2025. Laboratory-grown diamonds had dropped by 74% since 2020. Prices were expected to continue decreasing. De Beers had started 2024 with US$2bn worth of diamonds, which it had not sold by the end of ...

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