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Brand New 925 Sterling Silver Chain 18" 20.5g N925-138
- Product Code: N925-138
- Availability: In Stock
£79.00
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Certified & Hallmarked
Established Jeweller
Brand New 925 Sterling Silver Chain 18" 20.5g N925-138
This brand-new 18-inch link chain represents a high-standard specimen of 925 sterling silver craftsmanship. Verified through professional assay and weighing 20.5 grams, it balances significant tensile strength with refined aesthetics, making it an ideal core asset for both singular wear and pairing with heavy pendants.
Certified Mass
20.50g
Precision Weighted
Composition
925 Silver
Full UK Hallmark
Linear Reach
18 Inches
Princess Length
Reference No.
N925-138
Product SKU
Verification
Assayed
Totnes Workshop
Technical 7-Table Framework for Silver Assets
1. Metallurgical Purity & Alloy Integrity
| Alloy Type | Silver Percentage | Vickers Hardness | Assay Verification | Asset Status |
|---|---|---|---|---|
| Sterling Silver | 92.5% | Approx. 75 HV | Full UK Hallmark | Investment Grade |
| Fine Silver | 99.9% | Approx. 25 HV | Stamp Only | Bullion (Soft) |
| Silver Plate | <1% | Varies | No Hallmark | Fashion Grade |
Table 1 Analysis: This N925-138 specimen is confirmed as 92.5% pure silver alloyed with copper for structural durability. The 20.5g mass provides the necessary density to resist the warping often seen in lighter new silver chains.
2. Link Dimensions & Geometric Density
| Dimension Metric | Measurement | Tolerance | Structural Impact |
|---|---|---|---|
| Width | 5.3 mm | +/- 0.1mm | High Lateral Stability |
| Depth | 1.7 mm | +/- 0.1mm | Slim Profile Comfort |
| Gram per Inch | 1.14g | Certified | Substantial Drape |
Table 2 Analysis: The 5.3mm width combined with a 1.14g per inch density ensures this chain sits flat against the skin while providing enough "heft" to prevent flipping. It is technically superior for supporting a new gold pendant or silver equivalent.
3. Component Mechanical Audit
| Component | Material | Attachment Method | Security Rating |
|---|---|---|---|
| Lobster/Trigger Clasp | 925 Sterling | Mechanical Pivot | High-Security |
| Jump Rings | Solid 925 | Soldered Closure | Permanent |
| End Connectors | Assayed Gauge | Friction Fit + Solder | Reinforced |
Table 3 Analysis: Our mechanical audit confirms that all terminal connectors are soldered. This is critical for 20.5g chains, as unsoldered rings can open under the kinetic force of a moving pendant.
4. Environmental Resilience Matrix
| Environmental Factor | Impact on 925 Alloy | Technical Mitigation |
|---|---|---|
| Saline Air (Devon Coast) | Accelerated Sulphidation | Professional Micro-Polish |
| Chlorine Exposure | Surface Pitting | Immediate Freshwater Rinse |
| Skin Acidity | Localised Oxidation | Weekly Soft Cloth Buffing |
Table 4 Analysis: Silver naturally reacts with sulphur in the air. For Totnes-based owners, we recommend regular maintenance to preserve the specular reflection. Unlike plated items, this solid chain can be polished indefinitely without losing its silver finish.
5. Load-Bearing & Tensile Capacity
| Weight Class | Pendant Compatibility | Neckline Alignment | Stress Resistance |
|---|---|---|---|
| 20.5g (Standard Heavy) | Up to 35g Pendants | Princess (18") | Exceptional |
| <10g (Light) | Micro-Pendants Only | Varies | Moderate |
Table 5 Analysis: The tensile strength of this specific gauge is rated for significant daily wear. It maintains its linear integrity even when paired with heavy items, unlike thinner new silver bracelets or chains.
6. Regulatory Hallmark Verification
| Marking | Definition | Legal Requirement | Consumer Protection |
|---|---|---|---|
| 925 Fineness | Purity Standard | Mandatory >7.78g | Guaranteed Silver Content |
| Assay Office Mark | Testing Location | Mandatory UK Law | Third-Party Verification |
| Sponsor Mark | Manufacturer ID | Mandatory | Traceable Origin |
Table 6 Analysis: Because this item exceeds 7.78g, a UK hallmark is legally required. We verify every mark under microscope to ensure our customers receive genuine articles, matching the standards of our new platinum pendants.
7. Authority Benchmark: H.E. Phillips Ltd Standards
| Service Metric | H.E. Phillips Ltd Protocol | High-Street Competitors |
|---|---|---|
| Weight Audit | 0.01g Accuracy Scales | Rounded Estimates |
| Solder Verification | Hand-Inspected Links | Batch Sampling |
| Expertise | Physical Devon Workshop | Digital Distribution Only |
Table 7 Analysis: Operating from 19 Fore Street since August 2000, H.E. Phillips Ltd provides a level of forensic accuracy and aftercare that online-only retailers cannot match.
20 Technical FAQs: Engineering & Asset Management
Metallurgy & Composition
1. What is the precise silver content in 925 Sterling Silver?
925 Sterling Silver is an alloy consisting of 92.5% pure silver and 7.5% other metals, typically copper. This specific ratio is chemically engineered to provide the perfect balance between the metal's natural brilliance and the hardness required for functional jewelry that withstands daily mechanical stress.
2. Why is a hallmark necessary for a 20.5g chain?
Under the UK Hallmarking Act 1973, any silver item weighing more than 7.78 grams must be hallmarked by an independent Assay Office. This 20.5g chain carries these marks as a legal guarantee that the metal has been tested for fineness, protecting the consumer from sub-standard alloys.
3. Does this chain contain nickel or other allergens?
Our 925 Sterling Silver is sourced to comply with high safety standards, minimizing the presence of allergens like nickel. While silver is naturally hypoallergenic, the 7.5% copper alloy provides strength without the adverse skin reactions often associated with lower-quality "white metal" fashion jewelry.
4. How does the 1.14g per inch ratio affect durability?
A higher gram-per-inch ratio indicates thicker link walls and more solid construction. At 1.14g per inch, this chain is significantly more resistant to "stretching" or link elongation—a common failure in lightweight chains where the silver links thin out under the weight of a pendant over time.
Mechanical Strength & Design
5. Is the clasp mechanism tested for spring tension?
Yes. Every clasp on our new silver inventory undergoes a manual tension audit. The internal steel spring must provide a firm "snap-back" action to ensure the security of the 20.5g load, preventing accidental opening during vigorous movement.
6. Can I safely add a heavy pendant to this 5.3mm width?
Absolutely. A 5.3mm width is a "Medium-Heavy" gauge, capable of supporting pendants up to approximately 35g. The tensile strength of the soldered links ensures that the chain remains the strongest point of the assembly, provided the pendant's bail is properly sized.
7. Why are the terminal jump rings soldered instead of just closed?
Soldering creates a continuous loop of metal, which is technically superior to a "tension-closed" ring. For a chain of this weight, soldering is essential; it ensures that the connection between the chain and the clasp cannot be breached by a sharp tug or caught clothing.
8. What is the benefit of the 1.7mm depth?
The 1.7mm depth provides a "low-profile" fit. This technical design choice means the chain sits comfortably under shirt collars and doesn't create a bulky silhouette, while the 5.3mm width ensures it still has a bold visual presence when worn externally.
Maintenance & Environmental Care
9. How does the Devon maritime climate affect silver?
Coastal areas like Totnes have higher concentrations of airborne salts and moisture. These act as catalysts for oxidation. Because this chain is solid 925 silver, any tarnish is merely a surface reaction and can be fully reversed with a professional buffing cloth without damaging the metal.
10. Can I wear this 925 silver chain in a swimming pool?
We advise against it. Chlorine is a harsh oxidizing agent that can cause silver to turn black almost instantly and may eventually lead to "stress corrosion cracking" in the alloy. If exposure occurs, rinse immediately with fresh water and dry thoroughly with a soft cloth.
11. What is the best way to clean 20.5g of silver at home?
Use a dual-action jewelry cloth. The inner treated layer removes chemical tarnish through a mild abrasive action, while the outer layer restores the "mirror finish" or specular reflection. Avoid liquid dips for brand-new items as they can be overly aggressive on the finish.
12. Why does silver tarnish even when not being worn?
Silver reacts with hydrogen sulfide in the atmosphere to form silver sulfide. To minimize this when the chain is in storage, keep it in an airtight container or a tarnish-resistant pouch provided by H.E. Phillips Ltd to limit exposure to ambient air pollutants.
Investment & Authenticity
13. Does this chain hold its value over time?
Yes. As a solid 925 sterling silver asset, its value is tied to both the spot price of silver and its craftsmanship. Unlike silver-plated jewelry which has zero scrap value, a 20.5g solid chain retains its intrinsic commodity value for life.
14. How can I distinguish this from a "silver-filled" chain?
Silver-filled items are base metals bonded with a thick layer of silver. The most reliable technical test is the hallmark. This N925-138 chain features a deep-struck UK hallmark, which is only granted to solid alloys that pass rigorous assay testing.
15. What is the significance of the SKU N925-138?
This is our internal asset tracking code. It ensures that the specific weight (20.5g) and technical specifications are recorded in our database, allowing for precise identification and valuation should you require an insurance appraisal or future trade-in.
16. Is buying new silver better than buying pre-loved?
Buying "Brand New" ensures the item has zero microscopic link wear or "spring fatigue" in the clasp. It offers the longest possible lifespan for the asset. However, we also offer a wide range of second-hand silver chains for those seeking vintage character.
Comparison & Styling
17. How does the 18-inch length sit on the average neck?
An 18-inch length is considered "Princess" length. For most, it sits just below the throat on the collarbone. It is the most versatile technical length as it accommodates both high and low necklines and is the standard for most pendants.
18. Can this chain be worn alongside a watch?
Silver chains coordinate excellently with stainless steel or white gold timepieces. We recommend pairing this piece with our Casio or Citizen ranges for a cohesive, technically-focused aesthetic.
19. Do you offer trade-ins if I want to upgrade to gold?
Yes. We offer a transparent sell gold or sell silver service. You can use the metal value of this chain towards an upgrade to our new gold necklaces or other fine jewelry.
20. Why should I purchase from H.E. Phillips Ltd in Totnes?
H.E. Phillips Ltd (est. August 2000) provides physical accountability. Unlike online marketplaces, you can visit our 19 Fore Street showroom to have your chain professionally cleaned, inspected, or repaired by specialists who understand the metallurgy of your piece.
© 2026 H.E. Phillips Ltd - Your Official Authorised Horological and Fine Jewellery Specialist. All Technical Data verified for forensic accuracy.
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