Aureus: Difference between revisions

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The solidus was reintroduced by [[Constantine I]] (r. 306–337) in 312 AD, permanently replacing the ''aureus'' as the gold coin of the Roman Empire. The ''solidus'' was struck at a rate of 72 to a Roman pound of pure gold, each coin weighing twenty-four Greco-Roman carats, or about 4.5 grams of gold per coin. By this time, the solidus was worth 275,000 of the increasingly debased ''denarii''.
 
However, regardless of the ''size'' or ''weight'' of the ''aureus'', the coin's purity was little affected. Analysis of the Roman ''aureus'' shows the purity level usually to have been near to 24 [[Carat (purity)|carat]] gold in excess of 99%. The [[Sovereign (English coin)|English Sovereign]] (1489–1604) consisted of 23 carats of 95.83% gold for 14.9 grams gold content. The [[British sovereign coin|British Sovereign]] (1817–1917, 1925, 1957–present) is made of 91.7% of 22 carat gold for 7.3 grams gold content. The [[Eagle (United States coin)|American Eagle]] was specified by the [[Coinage Act of 1792]] as 247.5 grains (16.04 grams) of pure gold or 270 grains of "standard" gold, with "standard" gold being 11 parts fine gold to 1 part silver-copper alloy (basically 22 carat). The [[gold dollar|United States Gold Dollar]] (1849–1889) had 1.5 grams gold.
 
{| class="wikitable" style="float:right; margin-left:1.5em;"
|+'''Gold content and price comparison'''
!|Name!! |Gold Content!! style="text-align:center;"|Julius Caesar Aureus!! |USD Value
|-
|Julius Caesar Aureus||8.18 grams||1.000||$366.22
|-
|Nero Aureus||7.27 grams||0.889||$325.60
|-
|Caracalla Aureus||6.55 grams||0.800||$293.04
|-
|Diocletian Aureus||5.45 grams||0.667||$244.20
|-
|Constantine Solidus||4.55 grams||0.556||$203.50
|-
|EnglishBritish Sovereign||147.9032 grams||10.775||$667.24895
|-
|BritishUSA SovereignEagle 1837-1933||715.3205 grams||01.895||$327.82839
|-
|USA EagleGold 1796Dollar 1849-18331889||161.0451 grams||10.960||$717.86184
|-
|USA Eagle 1834-1836||15.73 grams||1.923||$704.33
|-
|USA Eagle 1837-1933||15.05 grams||1.839||$673.62
|-
|USA Gold Dollar 1849-1889||1.51 grams||0.184||$67.37
|}