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Brand New 925 Sterling Silver Chain 18" 7.8g N925-170
- Product Code: N925-170
- Availability: In Stock
£18.00
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Certified & Hallmarked
Established Jeweller
Brand New 925 Sterling Silver Chain 18" 7.8g N925-170
This brand-new 18-inch sterling silver chain represents a standard in contemporary jewellery engineering, offering a verified 7.8-gram mass that ensures both structural durability and refined aesthetics. Fully assayed to meet strict UK purity requirements, this piece serves as a reliable asset for daily wear or as a foundation for high-quality pendants.
Net Mass
7.80g
Calibrated Weight
Alloy Grade
925 Silver
Assayed Standard
Linear Span
18 Inches
Classic Length
Reference
N925-170
Product Serial
Condition
Brand New
Unworn Inventory
Technical 7-Table Framework for Silver Assets
1. Metallurgical Composition & Purity Verification
| Material | Silver % | Alloy Balance | Hardness (Vickers) | Standard |
|---|---|---|---|---|
| Sterling Silver | 92.5% | 7.5% Copper | ~75-100 Hv | UK Legal Requirement |
| Fine Silver | 99.9% | 0.1% Trace | ~25 Hv | Investment Only |
| Silver Plate | <1% | Base Metal Core | Variable | Non-Precious |
Table 1 Analysis: This chain is manufactured using the 925 sterling silver standard. The addition of copper is a technical necessity to increase the Vickers hardness from the soft state of fine silver to a durable alloy capable of resisting the mechanical stress of daily use.
2. Dimensional Analysis & Load Profile
| Dimension | Measurement | Tolerance | Technical Impact |
|---|---|---|---|
| Length | 18 Inches (45.7cm) | +/- 1mm | Universal anatomical fit |
| Width | 2.6 mm | +/- 0.1mm | High surface-area-to-weight ratio |
| Depth | 2.6 mm | +/- 0.1mm | Consistent cross-sectional integrity |
Table 2 Analysis: The 2.6mm gauge provides a robust profile for a 7.8g chain. This width-to-weight ratio ensures the links are solid enough to prevent "pinching" or kinking during sleep or active movement.
3. Structural Integrity & Link Geometry
| Feature | Specification | Benefit | Maintenance Requirement |
|---|---|---|---|
| Link Style | Classic Link | Maximum flexibility | Low - Ultrasonic clean only |
| Interlock Type | Symmetric Moveable | Reduces friction wear | Zero - Self-lubricating design |
| End Caps | Reinforced Silver | Supports pendant load | Check every 24 months |
Table 3 Analysis: Each link in the N925-170 is engineered for independent rotation, which minimizes the "sawing" effect of metal-on-metal friction. This significantly extends the lifespan of the chain compared to lower-quality new silver chains.
4. Mechanical Fastening Systems
| Component | Material | Verification | Security Rating |
|---|---|---|---|
| Spring Clasp | 925 Sterling Silver | 20-Cycle Snap Test | High-Security |
| Jump Rings | Solid 925 Silver | Seamless Join | Standard Industrial |
| Internal Spring | Stainless Steel | High Fatigue Resistance | Industrial Grade |
Table 4 Analysis: The clasp utilizes a high-tension internal spring. While the housing is silver, the internal spring is typically made of steel to ensure a "positive lock" action that does not weaken over time, providing security for your second-hand silver pendant charm.
5. Surface Finish & Specular Reflection
| Finish Type | Process | Reflectivity | Allergy Profile |
|---|---|---|---|
| Polished Silver | Mechanical Buffing | High (Specular) | Hypoallergenic (Nickel Free) |
| Rhodium Plated | Electro-chemical | Ultra-High | Non-Tarnish |
| Oxidized | Chemical Patina | Low (Matte) | Stylistic Choice |
Table 5 Analysis: This chain features a classic high-polish finish. We verify that our new inventory is free from nickel, making it safe for those with sensitive skin. The shine is a result of pure metallurgical lustre rather than temporary coatings.
6. Hallmarking & Compliance Benchmarks
| Marking | Authority | Legal Significance | Consumer Protection |
|---|---|---|---|
| 925 Stamp | Manufacturer | Initial Purity Claim | Self-Certified |
| Full Hallmark | UK Assay Office | Independent Verification | Statutory Legal Guarantee |
| H.E. Phillips Guarantee | Retailer | Refund Policy | Service Assurance |
Table 6 Analysis: For any silver item over 7.78g, a UK hallmark is mandatory. As this chain weighs 7.8g, it undergoes official testing at an Assay Office (London, Birmingham, Sheffield, or Edinburgh) to ensure the silver content is exactly as stated.
7. Asset Value Comparison
| Metric | Retail New (N925-170) | Investment Bullion | Costume Jewelry |
|---|---|---|---|
| Metal Content | Certified 925 | 999 Fine | None (Base Metal) |
| Wearability | Daily Use | Storage Only | Limited Lifespan |
| Resale Potential | Intrinsic + Brand | Spot Price Only | Zero |
Table 7 Analysis: Buying from hephillipsltd ensures you receive a piece that maintains intrinsic commodity value. Unlike costume jewelry that loses 100% of its value upon purchase, a hallmarked silver chain remains a tangible asset.
20 Technical FAQs: Engineering & Asset Management
Metallurgical Intelligence
1. Why is 925 the standard instead of 100% pure silver?
Pure silver (99.9%) is chemically "soft," making it prone to bending and severe scratching. By introducing 7.5% copper, the alloy's crystalline structure is strengthened, creating "Sterling" silver. This allows the 18-inch chain to retain its shape under the tension of a pendant or during the physical strain of being put on and taken off.
2. Does the 7.8g weight include the clasp and hallmarking?
Yes, the 7.8-gram measurement is the "gross weight" of the entire unit. This includes the links, the end caps, the jump rings, and the clasp mechanism. In professional jewellery, weight is always calculated as the total mass of the finished product to ensure the customer knows exactly how much silver they are acquiring.
3. Will this silver chain tarnish over time?
Tarnish is a natural chemical reaction called sulfidization, where silver reacts with sulfur in the air to form silver sulfide. It is not a sign of poor quality; in fact, it is a hallmark of genuine silver. Higher quality sterling silver is easy to clean with a specialist cloth, restoring the specular reflection instantly without damaging the underlying metal.
4. Is there any nickel in this 925 silver chain?
No. H.E. Phillips Ltd ensures all new inventory complies with the EU and UK REACH regulations regarding nickel release. This chain is hypoallergenic and safe for individuals with metal sensitivities, as it is composed solely of silver and copper alloys.
Structural & Mechanical Security
5. How strong is the 2.6mm link gauge?
A 2.6mm width provides a significant safety margin for a chain of this length. In tensile strength tests, a solid silver link of this thickness can withstand several kilograms of "dead weight" before deformation occurs. This makes it highly resistant to snapping if it accidentally catches on clothing.
6. Can I pair this with a heavy pendant?
Yes, the 7.8g mass is specifically chosen to provide a stable base for pendants. We generally recommend that a pendant should not exceed 1.5 to 2 times the weight of the chain for optimal comfort. Therefore, this chain is ideal for charms and pendants weighing up to approximately 12-15 grams.
7. What is the benefit of an 18-inch length?
18 inches is considered the "classic" length for silver chains. It typically sits just below the collarbone for most adults. Technically, this length allows for a natural "drape" that follows the neckline of most garments, providing enough slack to prevent the chain from feeling restrictive during movement.
8. Is the clasp repairable if the spring fails?
While the spring mechanism is designed for thousands of cycles, if it were to fail, the clasp can be replaced by a professional jeweller. Because the chain is made of standard 925 silver, it is "workbench friendly," meaning it can be soldered and repaired indefinitely, unlike plated or bonded chains.
Hallmarking & Legal Compliance
9. What does "Fully Hallmarked" actually mean?
A hallmark is an official mark struck on precious metals by an Assay Office. It involves an independent chemist scraping a tiny sample of the metal and testing it in a lab. If it passes, they apply the marks. This is a legal requirement in the UK for silver items weighing over 7.78 grams, providing you with absolute proof of purity.
10. Why is the N925-170 item specifically hallmarked?
Because this chain weighs 7.8g, it sits just above the legal exemption limit of 7.78g. This means it *must* have a full UK hallmark to be legally sold as sterling silver. This provides an extra layer of consumer protection that you don't get with lighter, un-hallmarked chains.
11. Where can I find the hallmark on this chain?
Hallmarks are typically located on the small "tag" or "tab" near the clasp, or sometimes on the clasp itself. You may need a 10x magnification loupe to see the specific symbols, which usually include the 925 fineness mark and the symbol of the Assay Office.
12. Is a "925" stamp the same as a hallmark?
No. A "925" stamp is a manufacturer's mark and can be applied by anyone. A hallmark is an independent verification from a government-regulated office. Always look for the official hallmark on items over the weight limit to ensure you aren't buying a counterfeit or under-karat piece.
Care & Maintenance
13. Can I wear this chain in a swimming pool?
We strongly advise against it. Chlorine is a powerful oxidizing agent that can cause silver to turn black almost instantly. It can also attack the copper in the alloy, leading to "stress corrosion cracking," which can make the links brittle over time.
14. How should I store the chain when not in use?
Store your chain in a cool, dry place, ideally in an airtight bag or a lined jewellery box. Keeping it away from open air reduces its exposure to sulfur, which significantly slows down the tarnishing process and keeps the specular shine for longer.
15. Is it safe to use liquid "silver dips"?
Use liquid dips with caution. While they are effective at removing tarnish, they are acidic and can "etch" the surface of the silver if left too long. A specialist polishing cloth is a safer mechanical method for maintaining the mirror finish of the N925-170.
16. Does frequent polishing wear down the silver?
Aggressive polishing with abrasive compounds can eventually remove microscopic layers of metal. However, using a soft microfibre jewellery cloth is gentle enough that you would have to polish it daily for decades to see any measurable loss in weight or link thickness.
Purchase & Ethics
17. Is this chain sustainably sourced?
H.E. Phillips Ltd works with reputable suppliers who adhere to ethical manufacturing standards. Furthermore, silver is a infinitely recyclable metal. Choosing a high-quality solid silver piece is an eco-friendly alternative to "fast fashion" jewellery that ends up in landfills.
18. What is the return policy for this item?
All purchases are backed by H.E. Phillips Ltd’s full refund policy. If the item does not meet your technical expectations or anatomical requirements, you can return it in its original "Brand New" condition for a full refund, ensuring a risk-free acquisition.
19. Can I trade this in later for a gold upgrade?
Yes. Because this is a hallmarked silver asset, it holds intrinsic value. We offer a sell gold or sell silver service where you can trade in your silver items toward the purchase of new gold necklaces or other fine jewellery.
20. How long has H.E. Phillips Ltd been in Totnes?
The shop has been a staple of the Totnes high street at 19 Fore Street since August 2000. This 25-year history provides you with the security of a physical hub for any future maintenance, cleaning, or advice regarding your jewellery collection.
© 2026 H.E. Phillips Ltd - Your Official Authorised Fine Jewellery Specialist. All Technical Data verified for accuracy.
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