The numbering system for gold is generally the karat scale. But theoretically, there could always by 825 gold. It would simply mean 82.5% gold, which is about 20 karat.
825 is not gold 825 is probably 925 meaning sterling silver blurred or miss stamped
825 is a reference to the gold purity i.e. 82.5% pure.
Of every 1000 parts (100%) of the metal, 825 (82.5%) are gold. So in the item there are 175 parts (17.5%) that are not gold As gold is soft then usually other metals added to make it harder.
825 means the gold mount is 82.5% pure.
How much is it worth
82.5% gold /silver what ever the metal is
10k Edit by Cjulsh 10k is incorrect. 10k jewelry would be stamped 417 which is the amount of gold content. 10k is 41.7% gold. 825 is a lower grade of silver...most silver pieces would have a stamp of 925 which is 92.5% silver. Some pieces will use a lower grade silver 825 or 82.5% silver.
That probably means it is the 825 th copy if it is somethin like a store bought necklace. If it is gold, iit means it is fake. ---------------------------------------- Most likely it is .825 grade silver if this ring is silver coloured . Still silver but lower grade than .825 sterling
825 as a fraction = 825/1
percent of 825 = 82500%825 * 100% = 82500%
$660=.8X82580 % of 825 = (80/100) of 825 =(80/100)*825=(8/10) *825=0.8*825660 dollarsTherefore, 80 percent of 825 dollars is 660 dollars.Source: www.icoachmath.com
825.0 and 825/1 are both equivalent to 825