What metal fineness is
Fineness is the content of pure precious metal in an alloy, expressed in thousandths. Pure silver or gold are too soft for jewelry, so they are alloyed with other metals (copper, zinc) for durability. The number on a piece (e.g. 925) states how much pure metal the alloy contains.
Silver fineness: 925 and 800
925 (sterling) is 92.5% pure silver — the jewelry standard, with a good durability-to-look ratio. 800 (80%) is used in utility items and older jewelry. Jewelry production is dominated by 925; we use it for our silver jewelry.
Gold fineness: 585 and 750
585 (14K) is 58.5% pure gold — durable and popular in everyday jewelry. 750 (18K) is 75% gold — a warmer colour and higher value, common in premium and engagement jewelry. Colour (yellow, white, rose) depends on the alloy. See gold jewelry.
How to read hallmarks
On a piece you will find the fineness number and — in Poland — the assay mark of the Assay Office, confirming the metal content. Maker and importer marks may also appear. We cover marking duties in jewelry hallmarking.
Which fineness for a collection
For silver jewelry — 925. For everyday gold — 585, for premium and engagement — 750. The choice affects metal cost, colour and brand positioning. In contract manufacturing you set the fineness in the specification; see custom production.
Summary
Fineness states how much pure metal is in the alloy: 925 for silver, 585 and 750 for gold. The assay mark confirms this content. Choosing fineness is a decision about cost, colour and positioning — worth considering at a collection's start.