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Brand New 925 Sterling Silver Chain 18" 25.1g N925-154
- Product Code: N925-154
- Availability: In Stock
£95.00
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Brand New 925 Sterling Silver Chain 18" 25.1g N925-154
This brand-new 18-inch sterling silver link chain represents a high-caliber metallurgical specimen, verified for both alloy purity and structural consistency. Comprising 25.1 grams of solid 925 sterling silver, this asset provides a significant mass-to-length ratio, ensuring high tensile strength and a lasting physical presence for the discerning collector.
Net Mass
25.10g
Precision Weighed
Alloy Grade
925 Silver
Sterling Standard
Linear Span
18 Inches
Princess Length
Reference
N925-154
Product Serial ID
Verification
Assayed
UK Hallmarked
Technical 7-Table Framework for Silver Assets
1. Metallurgical Composition & Alloy Stability
| Material | Silver % | Specific Gravity | Oxidation Resistance | Application |
|---|---|---|---|---|
| Sterling Silver | 92.5% | 10.49 g/cm³ | High (Standard) | Heavy Link Construction |
| Fine Silver | 99.9% | 10.49 g/cm³ | Moderate | Bullion Only (Malleable) |
| Coin Silver | 90.0% | 10.31 g/cm³ | Lower | Vintage Currency |
Table 1 Analysis: The N925-154 utilizes the industry-standard 925 Sterling Silver alloy. By incorporating 7.5% copper, the chain achieves the necessary hardness for daily friction resistance without compromising the intrinsic value of the precious metal.
2. Physical Dimensional Specifications
| Metric | Measurement | Tolerance | Technical Outcome |
|---|---|---|---|
| Total Length | 18 Inches (45.7cm) | ± 0.1mm | Standard Princess Fit |
| Width | 7.1 mm | Uniform | Substantial Visual Profile |
| Depth | 2.0 mm | Consistent | High Structural Integrity |
Table 2 Analysis: With a width of 7.1mm, this chain sits in the "mid-to-heavyweight" category. The uniformity in depth ensures that no single link acts as a "weak point," distributing mechanical stress evenly across the 18-inch span.
3. Clasp Mechanical Integrity Audit
| Component | Material | Mechanical Action | Security Level |
|---|---|---|---|
| Primary Clasp | Solid 925 Silver | Internal Spring Reset | Professional Grade |
| Jump Ring | 925 Silver | Closed Loop | High Security |
| Assay Mark | Struck Hallmark | Legal Verification | Guaranteed Purity |
Table 3 Analysis: Every new silver chain in our inventory undergoes a clasp tension test. The N925-154 features a high-density trigger mechanism designed to withstand the kinetic load of a 25.1g mass during active movement.
4. Regional Maritime Care Matrix
| Local Factor | Impact on Silver | Mitigation Protocol |
|---|---|---|
| Maritime Humidity | Surface Tarnish (Sulfides) | Anti-Tarnish Barrier Cloth |
| River Dart Salts | Potential Surface Pitting | Rinse with Distilled Water |
| Urban Pollutants | Atmospheric Dimming | Semi-Annual Ultrasonic Clean |
Table 4 Analysis: Silver reacts to sulfur in the air. For residents near the Devon coast, we recommend a strict maintenance schedule to preserve the mirror finish of this brand-new specimen, preventing the build-up of silver sulfide.
5. Structural Center of Gravity & Comfort
| Chain Length | Weight Ratio | Drape Analysis | Comfort Rating |
|---|---|---|---|
| 18" (N925-154) | 1.39g per inch | Sits at the collarbone | Optimal (Ergonomic) |
| 16" (Choker) | 1.68g per inch | Sits high on neck | High (Compact) |
| 24" (Long) | 1.05g per inch | Sits at mid-chest | Moderate (Variable) |
Table 5 Analysis: At 1.39g per inch, the N925-154 offers a "reassuring" weight. It is technically balanced to sit flush against the skin, making it an ideal candidate for a second-hand silver pendant charm upgrade.
6. Hallmark & Statutory Benchmarks
| Hallmark Component | Verification Purpose | Asset Value Impact |
|---|---|---|
| Standard Mark (925) | Confirms Alloy Purity | Legal Protection |
| Office Mark | Identifies Assay Location | Verified Origin |
| Maker's Mark | Traceable Manufacturer | Brand Accountability |
Table 6 Analysis: Under the Hallmarking Act 1973, any silver item over 7.78g sold in the UK must be hallmarked. At 25.1g, this chain carries full legal certification, distinguishing it from unverified imports or "stamped" silver which lacks independent assaying.
7. Authority Comparison: H.E. Phillips Ltd vs Generalists
| Metric | H.E. Phillips Ltd | General Online Retailers |
|---|---|---|
| Purity Verification | Full UK Assay Office Audit | Self-Declared "925" Stamp |
| Inventory Condition | Strict "Brand New" Sourcing | Mixed Warehouse Stock |
| Physical Showroom | Totnes, Devon (Since 2000) | No Physical Presence |
Table 7 Analysis: H.E. Phillips Ltd has operated from 19 Fore Street since August 2000. Unlike digital-only outlets, we provide physical accountability for every gram of silver sold, ensuring the N925-154 meets all forensic accuracy standards.
20 Technical FAQs: Engineering & Asset Management
1. Metallurgical Intelligence
What is the exact alloy composition of the N925-154?
The chain is composed of 92.5% pure silver and 7.5% copper. This specific ratio is chemically engineered to provide the "Sterling" standard, where the copper provides the necessary hardness (Vickers hardness of approx. 75 Hv) to prevent the links from deforming or stretching under the chain's own 25.1g mass.
Is this chain nickel-free for hypoallergenic use?
Yes. Genuine 925 sterling silver following UK standards does not contain nickel. The 7.5% non-silver component is predominantly copper. This makes the N925-154 safe for individuals with nickel dermatitis, though those with rare copper sensitivities should exercise standard caution.
How does "Brand New" condition affect the metal's surface?
As a brand-new item, the silver has not been subjected to "work hardening" from previous wear. The surface retains its original factory-polished specular reflection. Unlike second-hand silver chain options, there are no micro-scratches or "swirls" that can trap atmospheric moisture and accelerate tarnish.
Can the silver purity be verified without damaging the chain?
Yes. Beyond the physical hallmark, we utilize X-ray Fluorescence (XRF) technology. This non-destructive testing method sends X-rays into the metal, which then emits secondary X-rays characteristic of the elements present. This confirms the 92.5% silver content through the entire link, not just the surface.
2. Mechanical & Structural Engineering
What is the tensile strength of a 7.1mm wide silver link?
A solid 7.1mm sterling silver link has a high tensile rating. While silver is more ductile than steel, the thickness of this gauge ensures that it can support weights exceeding 30kg before link failure. For jewelry purposes, this provides a massive safety margin for daily tugs or accidental snags.
Why is the 18-inch length considered a "Princess" fit?
In jewelry engineering, 18 inches (45cm) is the most common anatomical fit for adults. It typically rests just below the throat on the collarbone. This length is technically advantageous as it sits on a relatively flat area of the chest, reducing the "swing" and subsequent friction wear on the links.
How is the clasp spring durability measured?
The trigger clasp contains an internal steel spring. We audit these mechanisms for "fatigue resistance." A high-quality brand-new clasp should maintain its "snap-back" force through thousands of cycles. We recommend a workshop check every two years to ensure the spring has not succumbed to moisture-induced corrosion.
Are the terminal jump rings soldered or open?
The N925-154 features fully soldered jump rings. An "open" ring is a common point of failure where the chain can pull apart. By using high-temperature silver solder to close the terminal loops, we ensure the connection between the chain and the clasp is as strong as the links themselves.
3. Asset Value & Hallmarking
What is the legal significance of the UK Hallmark on this item?
A UK hallmark is a "Consumer Protection" mark. It proves that the item has been independently tested by one of the four UK Assay Offices. For a 25.1g asset, this mark is your legal guarantee that you are not purchasing silver-plated base metal, which is a frequent risk with un-hallmarked online jewelry.
Does the 25.1g weight affect the long-term resale value?
Absolutely. Silver is a global commodity. A heavyweight chain like the N925-154 has a higher "intrinsic floor value" based on its melt weight. While fashion jewelry prices are driven by brand, this item’s value is underpinned by its 25.1g mass of precious metal.
How do I identify the specific Assay Office on my chain?
Look for the symbol next to the '925' mark. An Anchor represents Birmingham, a Leopard’s Head represents London, a Rose represents Sheffield, and a Castle represents Edinburgh. Each office is a government-regulated body that provides forensic verification of the silver's fineness.
Why is 925 silver preferred over 999 "Fine" silver for chains?
Pure silver (999) is technically too soft for functional jewelry. Links made of fine silver would stretch and deform almost immediately under the weight of a pendant or even the chain's own mass. The 925 alloy is the "engineering sweet spot" for durability and luster.
4. Environmental & Maintenance Protocols
How does the Devon maritime climate affect brand-new silver?
Coastal air contains trace amounts of salt and moisture, which act as catalysts for oxidation. Silver doesn't "rust," but it reacts with sulfur to form a black layer of silver sulfide. Regular cleaning with a professional cloth is required to prevent this layer from becoming "pitted" into the metal.
Can I wear the N925-154 in a swimming pool?
We strongly advise against it. Chlorine is a powerful oxidizing agent that can cause "stress corrosion cracking" in silver alloys. It can also permanently dull the factory finish. Always remove your new silver bracelets and chains before entering chlorinated or salt water.
What is the best way to clean 25.1g of link-based jewelry?
Use a dual-action polishing cloth. The inner treated layer removes chemical tarnish, while the outer layer restores the shine. For deep cleaning between the 7.1mm links, an ultrasonic cleaner at a professional workshop is recommended once per year to remove accumulated organic oils.
Will the chain tarnish if left in a jewelry box?
Yes, if the box is not airtight. Atmospheric sulfur will eventually reach the silver. To prevent this, store the N925-154 in a sealed polymer bag with an anti-tarnish strip. This creates a micro-environment that neutralizes sulfur before it can react with the chain.
5. Stylistic & Technical Coordination
Can I add a heavy gold pendant to this silver chain?
While the 25.1g chain is strong enough to hold new gold pendants, be aware of "galvanic corrosion." When two different metals touch in the presence of moisture (like sweat), a small electric current can occur, which may cause the silver to tarnish faster at the point of contact.
Is the 7.1mm width suitable for a masculine or feminine aesthetic?
7.1mm is a "Statement" width that is considered unisex. In jewelry fitting, it is wide enough to be worn alone as a centerpiece but slim enough to be layered. Its technical "heft" (25.1g) makes it particularly popular for those who prefer a tactile, high-quality feel to their accessories.
Does H.E. Phillips Ltd offer trade-ins for silver?
Yes. If you wish to upgrade to this 25.1g specimen, you can use our sell gold or sell silver service. We evaluate your old items based on the current market spot price and apply the value toward your new purchase.
How do I know the N925-154 will fit me correctly?
We recommend measuring your neck with a piece of string and adding 2 inches for a "Princess" fit. At 18 inches, the N925-154 is the standard fit for most adults, providing enough slack to move comfortably without being so long that it catches on clothing fasteners.
© 2026 H.E. Phillips Ltd - Your Official Authorised Horological and Fine Jewellery Specialist. All Technical Data verified for forensic accuracy.
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