Read the stamp
What does 999 mean on jewelry
999 GOLD is fine gold, while 999 SILVER is fine silver. The repeated digits express parts per thousand, not an item weight or a gemstone grade.
Reading the metal designation
999 GOLD is fine gold, while 999 SILVER is fine silver. 24K belongs to the gold karat scale; sterling silver is 925. The repeated digits express parts per thousand, not an item weight or a gemstone grade.
What to check next
EPNS and ALPACA describe different base-metal constructions from sterling. A silver standard can still appear on a gilded silver object. Check the mark on the main piece as well as detachable fittings, then use the separate signature to look up its maker.