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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 .

  3. Diamond simulant - Wikipedia

    en.wikipedia.org/wiki/Diamond_simulant

    A diamond simulant, diamond imitation or imitation diamond is an object or material with gemological characteristics similar to those of a diamond. Simulants are distinct from synthetic diamonds , which are actual diamonds exhibiting the same material properties as natural diamonds.

  4. Diamond enhancement - Wikipedia

    en.wikipedia.org/wiki/Diamond_enhancement

    The clarity, or purity, of a diamond refers to internal inclusions of the diamond, and is one of the 4-Cs in determining a diamond's value.Common inclusions that appear inside diamonds are black carbon spots and small cracks, commonly referred to as fractures or "feathers", due to their feathery whitish appearance when viewed from above or through the side.

  5. List of refractive indices - Wikipedia

    en.wikipedia.org/wiki/List_of_refractive_indices

    Some representative refractive indices; Name of material λ (nm) Refractive index no. n Reference Vacuum: 1 (by definition) Air at STP: 1.000273 [citation needed]Gases at 0 °C and 1 atm

  6. Diamond (gemstone) - Wikipedia

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

    The value of a diamond gemstone depends upon colour and quality, as well as weight. As of April 2024 the average price per carat of diamonds of between 1.00 and 1.49 carats was US$4,448. [48] The price of diamonds dropped significantly from a peak in 2022; prices of natural gems in shops dropped by 26% by the beginning of 2025.

  7. Diamonds as an investment - Wikipedia

    en.wikipedia.org/wiki/Diamonds_as_an_investment

    As of 2017 larger diamonds had appreciated in value since 2008 more than smaller ones. [4] [5] 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.

  8. Diamond color - Wikipedia

    en.wikipedia.org/wiki/Diamond_color

    In 2009, a 7-carat (1.4 g) blue diamond fetched the then highest price per carat ever paid for a diamond when it was sold at auction for 10.5 million Swiss francs (US$9.5 million at the time) which is in excess of US$1.3 million per carat. [17]

  9. Diamond flaw - Wikipedia

    en.wikipedia.org/wiki/Diamond_flaw

    Every natural diamond crystal contains impurities and typical intrinsic or "self-defects": vacancies, dislocations, and interstitial atoms. The most common impurity in diamond is nitrogen, which can comprise up to 1% of a diamond by mass. Nitrogen as a diamond impurity was first identified in 1959 by Kaiser and Bond of Bell Telephone. [1]

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