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  2. Diamond color - Wikipedia

    en.wikipedia.org/wiki/Diamond_color

    Diamond color grading chart. Refers to a grading scale for diamonds in the normal color range used by internationally recognized laboratories (GIA, IGI, & GCAL by Sarine for example). The scale ranges from D which is totally colorless to Z which is a pale yellow or brown color.

  3. Crystallographic defects in diamond - Wikipedia

    en.wikipedia.org/wiki/Crystallographic_defects...

    Synthetic diamonds of various colors grown by the high-pressure and high-temperature technique, the diamond size is ~2 mm. Infrared absorption spectrum of type IaB diamond. (1) region of nitrogen impurities absorption (here mostly due to the B-centers), (2) platelets peak, (3) self-absorption of diamond lattice, (4) hydrogen peaks at 3107 and ...

  4. Nashville Number System - Wikipedia

    en.wikipedia.org/wiki/Nashville_Number_System

    NNS charts also use unique rhythmic symbols, and variations in practice exist. A diamond shape around a number indicates that the chord should be held out or allowed to ring as a whole note. Conversely, the marcato symbol ^ over the number, or a staccato dot underneath, indicates that the chord should be immediately choked or stopped. The "push ...

  5. Material properties of diamond - Wikipedia

    en.wikipedia.org/wiki/Material_properties_of_diamond

    Pure (type IIa) diamond can be colored pink, red, or, brown owing to structural anomalies arising through plastic deformation during crystal growth; [20] these diamonds are rare (1.8% of gem diamonds), but constitute a large percentage of Australian diamonds. Type IIb diamonds, which account for ~0.1% of gem diamonds, are usually a steely blue ...

  6. List of jewellery types - Wikipedia

    en.wikipedia.org/wiki/List_of_jewellery_types

    This page was last edited on 6 February 2025, at 11:20 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.

  7. Hierarchy of precious substances - Wikipedia

    en.wikipedia.org/wiki/Hierarchy_of_precious...

    The measurement of sales of popular music starts high relative to the wedding anniversary scale, concentrating on gold and platinum (see gold album).Likewise, credit card companies usually have a "gold card" and a "platinum card" (many formerly had a "silver card" then followed by a "gold card", but due to similarity in appearance between silver and platinum these were often discontinued with ...

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  9. Diamond type - Wikipedia

    en.wikipedia.org/wiki/Diamond_type

    Most Ia diamonds are a mixture of IaA and IaB material; these diamonds belong to the Cape series, named after the diamond-rich region formerly known as Cape Province in South Africa, whose deposits are largely Type Ia. Type Ia diamonds often show sharp absorption bands with the main band at 415.5 nm (N3) and weaker lines at 478 nm (N2), 465 nm ...