10K SR means solid 10K gold with SR as the manufacturer's mark.
10K gold is 10/24 gold and 14/24 other alloying metals (usually copper and nickle)
Some might say that the SR means "silver", but standard nomenclature would be .925 or sterling or some percentage, indicating the type of silver or percentage silver. But not just silver. It wouldn't make sense not giving you the alloy amount. Having cut open a ring to re-size with 10K SR stamped on it , there is no silver inside the ring. It is good to be cautious. Get a guarantee. And if you are still in doubt, maybe have another jeweler resize it. (They'll tell you if it's plated or not.)
However if the ring indicated an alloy of silver base metal, the plating would wear over time. Some jewelers ( Whitehall as an example) will offer a plan that will cover 2 years worth of re-plating. After that, you're on your own. On a white gold ring, it won't be as noticeable but the sterling will have a less dull shine than the plating. As always with Sterling, keep it in a small ziplock bag to keep it from turning when not in use.
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14K SR likely means that the ring is made of 14 karat gold with the SR standing for "solid gold ring." This indicates that the ring is made of solid 14 karat gold throughout, as opposed to gold-plated or filled.
The initials SR stands for slightly rusted. The factories can get sued for infections on the fingers so they put that as a warning on the ring.
SR on a ring typically stands for "Sterling Silver," indicating that the ring is made of genuine sterling silver. Sterling silver is a popular metal for jewelry due to its durability and classic appearance.
SR on a ring likely stands for "Sterling Silver," indicating that the ring is made from sterling silver. Sterling silver is a popular metal alloy consisting of 92.5% silver and 7.5% other metals, typically copper.
Sr-0712
SR inside a ring typically stands for "Sterling Silver," indicating that the piece of jewelry or object is made of silver that is at least 92.5% pure. The term "Sterling Silver" is a standard designation in the jewelry industry to denote high-quality silver. The presence of SR inside a ring assures the consumer of the silver content and quality of the item.
In a 10ksr ring, the "z" typically indicates that the ring is made of 10-karat gold with a specific zinc alloy. The "sr" stands for "sterling," suggesting that the ring may also contain silver or is part of a design that incorporates sterling silver. Overall, the "z" signifies the alloy composition that contributes to the ring's durability and appearance.
"P4SR" marked on a ring could indicate that the ring is made of platinum (P), with a purity level of 950 parts per thousand (4/5). The "SR" could be a maker's mark or hallmark indicating the manufacturer or designer of the ring.
Bowling for Soup covered this,however the band SR 71 were the band who wrote it and recorded it first
http://en.wikipedia.org/wiki/SR-71_Blackbird