英国のホールマークには、 925 stamped on most silver articles plus other marks from the assay office and manufacturers letters. Google UK hall marks
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It means is 925% 純銀. 999 is also a purer, silver grade but is softer. Most metals are alloys and not 100% 純銀, gold etc. 残り 75% is copper. Hence why 925 tarnishes a dark colour. It can also end up with a pinkish hue after heating. Which is why jewellery is pickled in cleaning solution during the jewellery making process.
Sterling silver is an alloy of silver that contains up to 10% 銅. That is where the “925” designation comes from- それは約です 92.5% 銀. It has value as it is certainly a metal and it is mostly silver. スターリング 925 is worth about 90% of the market value of silver. At the time of this writing, silver was selling for about $17 an ounce so sterling 925 would bring about 10% less or roughly $14 に $16 an ounce. The fluctuation in price would be based upon the condition and the amount, with good quality sterling in a good quantity fetching the best prices.
