It means that 99.8% of the mass is silver. Sterling has a minimum of 92.5%.
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I think you are referring to .925.Sterling silver is an alloy of silver containing 92.5% by mass of silver and 7.5% by mass of other metals, usually copper. Sterling silver is most often used for jewelry because of its combination of attractiveness and durability. Acceptable quality marks for sterling silver include: sterling, ster and .925.
It means nothing at all - if it is stamped Sterling that means it is 92.5 percent silver - if it has no writing or stamping on it - it may or may not be silver - it means you should have it tested by a professional so you don't accidentally blind yourself with acid
The number 528 on a silver ring could potentially represent the purity or fineness of the silver used in the ring. In this context, 528 would indicate that the silver is 52.8% pure, which is equivalent to sterling silver. Sterling silver is a common alloy used in jewelry making, consisting of 92.5% silver and 7.5% other metals, typically copper. It is important to note that the number 528 may have different meanings depending on the jeweler or manufacturer.
f you mean a US quarter dated 1964 it's not sterling silver, it's coin silver (.900 silver & .100 copper) and value as of today is $3.25 just for the silver
If you mean a US quarter dated 1962 it's not sterling silver, it's coin silver (.900 silver & .100 copper) and value as of today is $3.25 just for the silver