If you're sourcing silver jewelry for retail, you'll see "925" and "sterling silver" everywhere — but what do these terms actually mean, and how do you verify you're getting genuine material? This guide answers those questions clearly, for buyers rather than jewelers.
What Does 925 Mean?
The number 925 refers to the silver content of the alloy: 92.5% pure silver. The remaining 7.5% is typically copper, which adds the structural strength pure silver lacks. Without this alloy, pure silver (999 or fine silver) would be too soft for most jewelry — it would bend and scratch from normal wear.
The 925 standard is recognized internationally and is equivalent to "sterling silver" in English-speaking markets. When a piece is stamped "925," ".925," or "S925," it means the alloy meets this purity threshold.
What's the Difference Between 925 Silver and Silver-Plated?
This is the most important distinction for buyers:
- 925 Sterling Silver: Solid silver alloy throughout the entire piece. The 925 marking refers to the full material.
- Silver-plated: A base metal (often brass, copper, or zinc alloy) with a thin layer of silver applied to the surface. The silver layer wears off over time, exposing the base metal underneath.
- Silver-filled: A thicker silver layer bonded to a base metal — better than plated, but not solid sterling.
When a manufacturer offers "silver jewelry" at prices significantly below market rate, always ask whether it is solid 925 or silver-plated. Request the hallmark.
The 925 Hallmark
In most countries, sterling silver jewelry should carry a physical hallmark — a small stamp pressed into the metal confirming purity. Common locations:
- Rings: Inside the band
- Necklaces/bracelets: On the clasp
- Pendants: On the bail (the loop)
- Earrings: On the post or butterfly back
For very thin pieces where physical stamping risks cracking the silver, laser engraving of the 925 mark is acceptable and equally legitimate.
UK Hallmarking — Special Requirements
The UK has stricter requirements than most countries. Under the UK Hallmarking Act 1973, any silver article weighing over 7.78g cannot be described as "silver" or "sterling" without an approved UK assay office hallmark. Items imported from Indonesia must be sent to a UK Assay Office (London, Birmingham, Edinburgh, or Sheffield) for hallmarking before being sold to UK consumers.
This is a common compliance issue for buyers new to importing silver jewelry into the UK. Budget for the assay fee and shipping in your pricing.
Will 925 Silver Tarnish?
Yes — all 925 sterling silver will tarnish over time when exposed to air, moisture, and skin acids. Tarnish is a surface oxidation (silver sulfide) that gives silver a dull, dark, or yellowish appearance. This is normal and expected, and is easily removed with a silver polishing cloth.
Factors that accelerate tarnishing:
- Exposure to chlorine (swimming pools, cleaning products)
- Contact with perfumes, lotions, or hairspray
- High humidity and heat
- Contact with rubber (which contains sulfur)
Rhodium plating, which is applied over sterling silver, creates a harder, tarnish-resistant surface. Many white gold-colored silver pieces use rhodium plating for durability. It does wear away over time and can be replated.
Is 925 Silver Nickel-Free?
925 sterling silver alloy itself does not contain nickel — the standard alloy is silver + copper. However, some lower-quality silver alloys substitute cheap metals including nickel to reduce cost. Additionally, some silver plating processes use nickel as an underplating layer.
For buyers selling in the EU or UK, always request written confirmation that the jewelry is nickel-free, meeting the EU Nickel Directive requirements. At Artistica, all production is nickel-free and can be confirmed in documentation.
How to Test if Silver is Genuine
Several quick tests can help verify sterling silver authenticity:
- Magnet test: Silver is not magnetic. If a piece is attracted to a strong magnet, it contains iron or steel.
- Ice test: Silver has exceptionally high thermal conductivity. Place an ice cube on a flat silver piece — it should melt noticeably faster than on other metals.
- Acid test: A nitric acid spot test is the most definitive simple test. Genuine sterling silver turns cream-colored; base metals react differently.
- XRF testing: X-ray fluorescence analyzers (available at assay offices and some jewelers) give exact alloy composition.
Why Buy 925 Silver Jewelry from Indonesia?
Indonesia has a centuries-old silversmithing tradition, particularly in Bali, Yogyakarta, and Surabaya. Indonesian silversmiths are known for intricate handwork, organic forms, and artisan techniques not easily replicated by machine production.
Artistica Jewelry in Surabaya has supplied genuine 925 sterling silver — hallmarked, nickel-free, and lead-free — to wholesale buyers across Europe, the USA, and Australia since 2003. Every piece is documented and certified.