Editing Carat (mass) (section)

=== Greco-Roman ===
The ''solidus'' was also a [[Roman Empire|Roman]] weight unit. There is literary evidence that the weight of 72&nbsp;coins of the type called ''[[solidus (coin)|solidus]]'' was exactly 1 [[Roman pound]], and that the weight of 1&nbsp;''solidus'' was 24&nbsp;''[[siliqua]]e''. The weight of a Roman pound is generally believed to have been 327.45&nbsp;g or possibly up to 5&nbsp;g less. Therefore, the metric equivalent of 1 ''siliqua'' was approximately 189&nbsp;mg. The Greeks had a similar unit of the same value.<ref name="grierson">{{cite journal | last=Grierson | first=Philip | title=The Monetary Reforms of 'Abd Al-Malik | journal=Journal of the Economic and Social History of the Orient | volume=3 | year=1960 | pages=241–264 | doi = 10.1163/156852060X00098 | issue=3}}</ref>

Gold [[fineness]] in [[Fineness#Karat|carats]] comes from carats and grains of gold in a solidus of coin. The conversion rates 1&nbsp;solidus = 24&nbsp;carats, 1&nbsp;carat = 4&nbsp;grains still stand.<ref>{{cite journal |last1=Harper |first1=K |title=People, Plagues, and Prices in the Roman World: The Evidence from Egypt |url=https://www.cambridge.org/core/journals/journal-of-economic-history/article/people-plagues-and-prices-in-the-roman-world-the-evidence-from-egypt/50D27EAD5045D12C1573DFFB5D5C029C |journal=The Journal of Economic History |year=2016 |volume=76 |issue=3 |pages=803–839 |publisher=Cambridge University |doi=10.1017/S0022050716000826 |access-date=16 June 2019}}</ref> Woolhouse's ''Measures, Weights and Moneys of All Nations''<ref name=":0">{{cite book| last= Woolhouse| first= W. S. B. |title= Measures, Weights and Moneys of All Nations| url= https://archive.org/details/measuresweightsm00woolrich| year=1891}}</ref> gives gold fineness in carats of 4 grains, and [[silver]] in troy pounds<ref name=":0" /> of 12&nbsp;[[troy ounce]]s of 20&nbsp;[[pennyweight]] each.{{clarify|date=January 2012|reason=Why are we citing a 100+ year old book for information on current units, in a section on ancient units?}}