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Parts of Fizban's Treasury of Dragons were developed through Unearthed Arcana, a public playtest series. [10] In October 2020, 2020: Subclasses, Part 5 featured two new draconic themed subclasses [11] [12] and then in April 2021, 2021: Draconic Options featured new variant Dragonborn subraces and an alternate player version of the Kobold race along with new draconic themed feats and spells.
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
The gem dragons appeared in the second edition in the Monstrous Compendium Fiend Folio Appendix (1992), [61] and the Monstrous Manual (1993). [62] They appeared as player character races in the Council of Wyrms set (1994) [63] and the Campaign Option: Council of Wyrms book (1999). [64] The gem dragons appeared in the third edition in Monster ...
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The "chelsea" filter was originally devised by Anderson and Payne in 1934 of the Gem testing Laboratory of the London Chamber of Commerce & Industry.The filter was devised with the collaboration of gemmology students of the Chelsea College of Science and Technology where Basil Anderson was an instructor for the Gemmological Association of Great Britain.
Gemstones of the World revised 5th edition, 2013 by Walter Schumann ISBN 978-1454909538 Smithsonian Handbook: Gemstones by Cally Hall, 2nd ed. 2002 ISBN 978-0789489852 hide
PDF version of the chart. The colors of the chart were described by McCamy et al. with colorimetric measurements using the CIE 1931 2° standard observer and Illuminant C, and also in terms of the Munsell color system. Using measured reflectance spectra, it is possible to derive CIELAB coordinates for Illuminants D 65 and D 50 and coordinates ...
A ruby is a pink to blood-red colored gemstone, a variety of the mineral corundum (aluminium oxide). Other varieties of gem-quality corundum are called sapphires. Ruby is one of the traditional cardinal gems, together with amethyst, sapphire, emerald, and diamond. [1] The word ruby comes from ruber, Latin for red.