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The Process Behind Creating New Gold Necklaces
The transition from raw bullion to a refined piece of fine jewellery is a journey of metallurgical precision and artistic discipline. At H.E. Phillips Ltd, established in August 2000, we apply a technical audit to every stage of necklace production, ensuring that each piece meets the highest UK standards for durability and purity.
Technical 7-Table Framework for Necklace Production
1. Metallurgical Purity & Composition
| Gold Type | Pure Gold % | Vickers Hardness (Hv) | Specific Gravity (g/cm³) | Common Alloys |
|---|---|---|---|---|
| 9ct Gold | 37.5% | 120 – 150 Hv | 11.2 – 11.5 g/cm³ | Silver, Copper, Zinc |
| 14ct Gold | 58.5% | 130 – 160 Hv | 13.1 – 13.6 g/cm³ | Palladium, Silver |
| 18ct Gold | 75.0% | 150 – 185 Hv | 15.2 – 15.9 g/cm³ | Copper, Silver |
| 24ct Gold | 99.9% | 25 – 30 Hv | 19.3 g/cm³ | None (Pure) |
Table 1 Analysis: Understanding the Vickers Hardness is critical for necklace longevity. Pure 24ct gold is technically unsuitable for complex chains due to its low Hv rating, which leads to rapid deformation. At H.E. Phillips Ltd, we primarily utilise 9ct and 18ct gold. The 18ct alloy provides a superior specific gravity, giving the necklace a "substantial" feel, while the 9ct variant offers enhanced resistance to surface abrasions. Our workshop ensures every batch of gold is alloyed to these exact metallurgical benchmarks before casting begins.
2. Lost-Wax Casting Stages
| Phase | Technical Action | Critical Tolerance | Workshop Outcome |
|---|---|---|---|
| Wax Prototyping | Precision Injection | ± 0.05mm | Exact Geometric Replica |
| Investing | Ceramic Encapsulation | Vacuum Pressure | Void-Free Mould |
| Burnout | Thermal Evacuation | 730°C | Carbon-Free Cavity |
| Centrifugal Casting | Molten Injection | Over-Pressure | Dense Atomic Structure |
Table 2 Analysis: The lost-wax casting process is the bridge between digital CAD design and physical gold. We maintain strict thermal tolerances during the burnout phase to ensure no residual carbon remains, which would otherwise cause porosity in the new gold necklaces. Centrifugal casting is used to force the molten metal into the finest details of the mould, ensuring the chain links have the required tensile strength to support pendants and withstand daily wear.
3. Finishing & Abrasive Protocols
| Grit Level | Tooling Type | Surface Impact | Target Finish |
|---|---|---|---|
| Coarse Filing | Hand Swiss Files | Removal of Sprue | Levelled Joins |
| Medium Prep | Silicon Wheels | Scratch Erasure | Satin Uniformity |
| Final Polish | Cotton Mop / Rouge | Molecular Smoothing | High-Specular Mirror |
| Ultrasonic | Cavitation Bath | Debris Removal | Chemically Clean |
Table 3 Analysis: After casting, gold arrives in a "raw" state with a dull surface. Our finishing protocol involves four distinct stages of abrasion. We use hand-filing to remove the casting sprue, followed by progressive polishing. The final "high-specular" finish is achieved through molecular smoothing using specialised compounds. This process not only enhances the aesthetic brilliance of the gold but also hardens the surface through friction, providing an additional layer of resistance against regional environmental factors such as salt air.
4. Chain Link Geometry & Strength
| Chain Style | Link Structure | Tensile Rating | Best Use Case |
|---|---|---|---|
| Curb Chain | Interlocking Flat | Maximum | Heavy Pendants / Daily Wear |
| Belcher Chain | Circular D-Section | High | Traditional Styling |
| Snake Chain | Internal Plates | Medium-Low | Occasional Lightweight Wear |
| Rope Chain | Spiral Interweave | High | Statement Aesthetics |
Table 4 Analysis: The mechanical design of the chain determines its lifespan. Curb and Belcher designs offer superior tensile strength because the load is distributed across interlocking solid links. Snake chains, while aesthetically sleek, are prone to kinking due to their internal plate structure. At H.E. Phillips Ltd, we audit the "link-to-joint" ratio of all new gold necklaces to ensure they can support the weight of a new gold pendant without premature stretching of the alloy.
5. Gemstone Setting Security
| Setting Method | Metal Contact | Security Rating | Technical Advantage |
|---|---|---|---|
| Bezel / Rub-over | 360° Enclosure | Maximum | Total Girdle Protection |
| Claw / Prong | Point Contact | High | Maximum Light Refraction |
| Grain Setting | Beaded Metal | Medium-High | Flush Surface Aesthetic |
Table 5 Analysis: When adding stones to a necklace, the setting must be technically sound. Our rub-over settings provide a continuous wall of gold around the gemstone, which is ideal for necklaces that may encounter friction against clothing. For diamond pieces, we often utilise claw settings to allow light to enter the pavilion. Every stone is checked under 10x magnification as part of the H.E. Phillips Visual Inspection Protocol to ensure zero "rattle" and perfect alignment before the piece leaves our Totnes workshop.
6. Hallmarking Compliance Data
| Hallmark Component | Identification | Statutory Requirement | Consumer Assurance |
|---|---|---|---|
| Sponsor's Mark | HEP (Unique) | Mandatory | Traceability to Workshop |
| Standard Mark | 750 / 375 | Mandatory | Guaranteed Gold Purity |
| Assay Office | Anchor / Leopard | Mandatory | Independent UK Audit |
Table 6 Analysis: In the UK, any gold necklace weighing over 1 gram must be hallmarked by law. This is an independent verification of the metal's purity. Our pieces are sent to the UK Assay Office where they undergo "cupellation" or X-ray fluorescence testing. This technical safeguard prevents the sale of sub-standard alloys. By maintaining our establishment in Totnes since 2000, H.E. Phillips Ltd ensures every hallmark is a verifiable record of quality, protecting the financial equity of your fine jewellery purchase.
7. Regional Environmental Impact: Devon Coast
| Factor | Metallurgical Effect | Workshop Mitigation |
|---|---|---|
| Salt Air (Coastal) | Surface Oxidation | Specular Micro-Polishing |
| River Dart Humidity | Base Metal Tarnish | Airtight Protective Barriers |
| Hard Water | Calcium Buildup | Ultrasonic Descaling |
Table 7 Analysis: The maritime environment of Devon, specifically around the River Dart, presents unique challenges for gold alloys. Salt-laden air can accelerate the dulling of the copper and silver used in 9ct and 18ct gold. We recommend an annual professional clean at our Fore Street hub. Our workshop uses industrial ultrasonic technology to remove microscopic debris from chain links, preventing the abrasive "grinding" effect that occurs when salt and dust settle into moving parts.
20 Technical Authority FAQs
Metallurgy & Purity
1. Why is 24ct gold rarely used for necklaces?
Pure 24ct gold has a Vickers Hardness of only 25–30 Hv, making it extremely soft. For a necklace, this means the links would stretch and eventually snap under the weight of the piece itself. By alloying gold with silver and copper to create 9ct or 18ct, we increase the hardness to over 120 Hv, ensuring the chain maintains its shape and security over decades of wear.
2. How does 18ct gold differ from 9ct in a necklace?
18ct gold contains 75% pure gold, resulting in a higher specific gravity (15.2 g/cm³) and a richer yellow tone. 9ct gold contains 37.5% pure gold but is harder due to the higher concentration of alloy metals. For a daily-wear chain, 9ct is highly durable, whereas 18ct is preferred for high-value investment pieces and luxury new gold rings.
3. What causes "green skin" from gold jewellery?
This is a chemical reaction between the copper in the gold alloy and the acids in skin or lotions. It is far more common in low-purity alloys or "gold-plated" items. Genuine UK-hallmarked gold from H.E. Phillips Ltd is alloyed to strict standards to minimise this reaction. Regular cleaning at our workshop helps remove the acidic residues that trigger oxidation.
4. Is white gold naturally white?
No, white gold is an alloy of yellow gold and white metals like palladium. To achieve a bright, silvery-white finish, it is plated with Rhodium. Over time, this plating may wear. We offer a professional re-rhodium service to restore the brilliance of your new gold necklaces, ensuring they maintain their contemporary aesthetic.
The Casting Process
5. What is "porosity" in gold casting?
Porosity refers to microscopic bubbles trapped in the gold during casting. This weakens the metal and creates pits on the surface. We prevent this by using vacuum-pressure casting and precisely controlling the melt temperature. This technical rigour ensures every piece of fine jewellery we produce has a dense, uniform molecular structure.
6. Why is CAD used in modern necklace design?
Computer-Aided Design (CAD) allows us to calculate the exact weight and balance of a necklace before it is made. This ensures that a new gold pendant will sit flat against the chest and that the chain links are thick enough to support the intended load, eliminating the guesswork associated with traditional hand-carving.
7. How is the "rough" gold smoothed after casting?
We use a multi-stage abrasive process starting with 400-grit files and ending with 8000-grit polishing rouge. This removes the "casting skin" and reveals the metal's natural lustre. Each step is performed by hand in our workshop to ensure that crisp edges are maintained while rounded surfaces are perfectly symmetrical and mirror-finished.
8. What is the role of the "sprue" in casting?
The sprue is a channel that allows molten gold to enter the mould. Once the casting is complete, the sprue is removed. At H.E. Phillips Ltd, we meticulously file and polish the attachment point to ensure the join is invisible, maintaining the seamless flow of the necklace's design and preventing any sharp edges that could irritate the wearer.
Chain Mechanics & Security
9. Which clasp is most secure for a gold necklace?
The Lobster Clasp is widely considered the most secure due to its spring-loaded mechanism and solid construction. For lighter chains, a Bolt Ring is often used. We audit every clasp for spring tension before sale. If you have a high-value piece, we can retrofit a safety chain for added security. Visit us at 19 Fore Street for a mechanical clasp audit.
10. Why do gold chains stretch over time?
Stretching occurs at the points where links interlock. Friction gradually wears away the metal, making the links thinner and longer. This is why we recommend an annual "Wear Audit." By checking for thin links early, we can perform targeted repairs to prevent the chain from snapping and losing your new gold pendant.
11. Can a broken gold chain be repaired invisibly?
Yes, through a process called "soldering" or "laser welding." Laser welding is particularly effective as it allows us to join links without heating the surrounding stones or metal. This results in a repair that is nearly impossible to see with the naked eye, restoring the structural integrity of your necklace to its original factory state.
12. What is the standard necklace length in the UK?
The most common lengths are 18 inches (Princess length) and 20 inches (Matinee length). However, we can customise any chain to your exact requirements. Choosing the correct length is vital for both comfort and aesthetic balance. We offer a "Fit Consultation" in our Totnes showroom to help you find the ideal drape for your frame.
Maintenance & Regional Care
13. How does salt air affect gold in Devon?
Salt air is highly corrosive to the base metals (copper/silver) in gold alloys. It can leave a dull, brownish film on the surface. To mitigate this, we recommend a "Maritime Care" routine: rinse your jewellery in fresh water after coastal exposure and bring it to us for a professional buffing to restore the specular finish every 12 months.
14. Can I clean my necklace with toothpaste?
We strictly advise against this. Toothpaste contains abrasive particles designed for tooth enamel, which can permanently scratch the surface of soft gold alloys. Instead, use a solution of warm water and mild detergent. For a technical clean that reaches inside the links, our ultrasonic service is the only way to remove embedded Devon grit and oils safely.
15. Is it safe to wear gold in a swimming pool?
Chlorine is a primary enemy of gold alloys. It causes "stress corrosion cracking," which can make gold brittle and prone to sudden failure. Always remove your new gold earrings and necklaces before swimming. If exposure occurs, rinse the piece immediately in distilled water to neutralise the chemicals.
16. How should I store my necklace to prevent tangling?
Store necklaces individually in a soft pouch or hang them on a dedicated stand. Tangling causes microscopic scratches as links rub together. If a knot occurs, do not pull it; this can stretch the links. Bring it to our workshop where we use specialised lubricants and fine-point tools to untangle the chain without damaging the metal.
Trust & Acquisition
17. Why is a UK hallmark essential for trust?
A hallmark is a legal guarantee. Without it, you have no way of verifying that a "18ct" necklace isn't actually a lower-grade alloy. At H.E. Phillips Ltd, we ensure every piece over 1 gram is hallmarked at a UK Assay Office. This transparency is why we have been a trusted name in Totnes since August 2000. Learn more on our About Us page.
18. Do you sell pre-owned gold necklaces?
Yes, we curate a selection of second-hand gold items that have passed our rigorous 12-point inspection. Each piece is ultrasonically cleaned and polished to a "near-new" standard. Pre-owned jewellery offers exceptional value and unique historical designs, such as Victorian or Edwardian styles that are no longer in mass production.
19. Can I buy a new gold necklace online securely?
Absolutely. We offer fully insured UK delivery for all purchases made via hephillipsltd.com. We use tamper-proof packaging and tracked shipping to ensure your piece arrives in pristine condition. Our online customers receive the same technical support and aftercare as those who visit our physical store in Devon.
20. What watch brands complement gold necklaces?
We are authorised stockists for Rotary and Citizen Eco-Drive. Many of these watches feature gold-tone PVD or solid gold accents that coordinate perfectly with our necklaces. A high-quality watch from Casio or Timex is a functional asset that mirrors the durability of our fine jewellery.
© 2026 H E Phillips Ltd - Your Official Authorised Horological and Fine Jewellery Specialist. All Technical Data verified for forensic accuracy.
