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The Process of Making a Platinum Pendant
The creation of a platinum pendant is a rigorous metallurgical journey that transforms one of the Earth's rarest elements into a durable, mirror-finished asset. Since August 2000, H.E. Phillips Ltd has applied forensic precision to the crafting and sourcing of fine jewellery Devon, ensuring that every new platinum pendant meets exact structural and aesthetic benchmarks.
7-Table Framework of Platinum Craftsmanship
1. Metallurgical Properties of Platinum (950)
| Metal Type | Purity | Vickers Hardness (Hv) | Specific Gravity (g/cm³) | Melting Point |
|---|---|---|---|---|
| Platinum (Plat 950) | 95.0% | 120 – 135 Hv | 21.45 g/cm³ | 1,768°C |
| 18ct White Gold | 75.0% | 150 – 180 Hv | 15.2 – 15.9 g/cm³ | 900 – 1,100°C |
| 925 Silver | 92.5% | 75 – 100 Hv | 10.49 g/cm³ | 961.8°C |
Table 1 Analysis: Platinum’s technical profile is defined by its extreme density and high melting point. With a specific gravity of 21.45 g/cm³, a platinum pendant is significantly heavier than an identical design in gold or silver. Unlike white gold, which is alloyed and rhodium-plated, platinum is naturally white and maintains its volume even when scratched. At H.E. Phillips Ltd, we utilize these properties to ensure new platinum diamond rings and pendants offer unparalleled security for high-value gemstones.
2. The Casting Phase: Precision Audits
| Stage | Technical Action | Workshop Check | Tolerance Level |
|---|---|---|---|
| CAD/Wax Model | 3D Precision Printing | Visual Geometry Review | ±0.01mm |
| Investing | Plaster Encapsulation | Degassing/Vacuum Cycle | Zero Air Bubbles |
| Casting | Lost-Wax Extraction | Inert Gas Induction | Atmospheric Control |
Table 2 Analysis: The transition from a digital CAD blueprint to a physical platinum form requires rigorous atmospheric control. Because platinum reacts with oxygen at high temperatures, we advocate for induction casting in inert environments. The wax model serves as the "master geometry," ensuring that symmetry is maintained before the metal is poured. Any air bubbles in the investment plaster can lead to surface porosity, which is why our workshop protocol mandates a vacuum degassing cycle to ensure the structural soul of the pendant is flawless.
3. Hand-Guided Refinement Matrix
| Tooling | Purpose | Technical Outcome | Audit Frequency |
|---|---|---|---|
| Precision Files | Material Removal | Dimensional Accuracy | Continuous |
| Buffing Wheels | Surface Levelling | Vickers Surface Integrity | Post-Filing |
| Mirror Polish | Specular Finish | Molecular Smoothness | Final Phase |
Table 3 Analysis: Once the rough casting is removed from the mould, it requires manual refinement. Platinum’s "gummy" nature during filing makes it more difficult to work with than gold. Our specialists use graduated abrasives to remove casting sprue marks and smooth the surface. This is a hand-guided process that preserves the design’s crisp edges while preparing the metal for the final high-specular polish. This level of meticulous hand-finishing is what defines the quality found at hephillipsltd.
4. Gemstone Setting Security Benchmarks
| Setting Style | Platinum Advantage | Security Rating | Micro-Inspection |
|---|---|---|---|
| Prong/Claw | Ductility (Bends, doesn't snap) | Maximum | 10x Loupe Check |
| Bezel | Structural Wall Strength | Maximum | Full Girdle Coverage |
| Channel | Inherent Rigidity | High | Zero Lateral Play |
Table 4 Analysis: Platinum is the premier choice for setting GIA certified diamonds due to its ductility. While gold prongs can become brittle over time, platinum prongs can be made finer while providing superior grip. Our workshop audit ensures that each stone is seated within the metal with zero "rattle," utilizing the metal's density to create a permanent mechanical lock. This is particularly vital for new diamond earrings where weight and security must be perfectly balanced.
5. Regional Environmental Impact: South West / River Dart
| Factor | Impact on Platinum | Mitigation Protocol |
|---|---|---|
| Salt Air Exposure | Surface Patina Acceleration | Micro-Fibre Polishing |
| River Dart Humidity | Zero Corrosion (Inert Metal) | Periodic Ultrasonic Cleaning |
| Hard Water Residue | Calcium Buildup on Stones | Professional Steam Clean |
Table 5 Analysis: For residents in coastal Devon or near the River Dart, platinum is the most resilient choice. Unlike silver or low-karat gold, platinum is chemically inert and does not tarnish or corrode when exposed to salt-rich maritime air. However, the South West's environment can lead to a "patina of wear"—a soft matte finish caused by micro-scratches. At our Totnes hub, we provide professional cleaning services to remove mineral deposits and restore the bright, white shine that defines platinum craftsmanship.
6. Hallmarking & Provenance Audit
| Marking | Requirement | Consumer Guarantee |
|---|---|---|
| Plat 950 | Compulsory | Verified 95% Pure Platinum |
| Assay Office Mark | Compulsory (e.g. Anchor/Leopard) | Independent UK Audit |
| Maker's Mark | Compulsory | Traceable Workshop Origin |
Table 6 Analysis: In the UK, every platinum piece weighing over 0.5 grams must be legally hallmarked. We ensure all new platinum necklaces and pendants are sent to an independent Assay Office. This mark is a forensic guarantee that the item is not merely "platinum plated" but a solid 950 purity asset. Since August 2000, H.E. Phillips Ltd has maintained a strict "Zero False Truths" policy, ensuring our customers have absolute confidence in the metallurgical value of their purchase.
7. Authority Hub: Workshop vs Mass Production
| Feature | Handmade Specialist | Mass Produced |
|---|---|---|
| Material Density | High (Compressed Casting) | Variable (Porosity risks) |
| Stone Security | Hand-Tensioned Claws | Machine Pressed |
| Serviceability | Local Workshop (Since 2000) | Third-Party Mail-In |
Table 7 Analysis: The technical distinction between a handmade pendant and a mass-produced one lies in the refinement of the finishing. Machine-made pieces often exhibit casting "flashes" or thinning in high-stress areas. Our hand-guided process ensures that every new gold pendant or platinum piece is audited for wall thickness and mechanical integrity. Choosing a specialist established in August 2000 ensures you receive a wearable work of art backed by 27+ years of trade expertise and local accountability.
20 technical faqs
Metallurgy & Durability
1. Why is platinum heavier than gold?
Platinum has a higher specific gravity (21.45 g/cm³) compared to 18ct gold (approx. 15.5 g/cm³). This means it is much denser at a molecular level. When you wear a new platinum pendant, you will notice a significant "heft" compared to other metals. This density also contributes to its extreme durability and resistance to wear over decades.
2. Does platinum tarnish in salt air?
No. Platinum is a noble metal and is chemically inert. It does not react with oxygen or sulphur, meaning it will never tarnish or turn black, even in the coastal environment of Devon. While it may develop a matte patina over time, the metal itself remains pure and unchanged. For those seeking a similar look in gold, our new gold necklaces offer a classic alternative.
3. What is the Vickers Hardness of platinum?
Annealed platinum has a Vickers hardness of approximately 40-50 Hv, but when alloyed for jewellery (Plat 950) and work-hardened, it reaches 120-135 Hv. While it is slightly "softer" than some gold alloys in terms of scratch resistance, it is much tougher. This means that while it might scratch, the metal is not lost; it is simply displaced, preserving the weight of the piece.
4. Is platinum hypoallergenic?
Yes. Because platinum jewellery is 95% pure, it is naturally hypoallergenic. It does not contain nickel or other base metal allergens often found in lower-karat white gold. This makes it the ideal choice for sensitive skin. We ensure all our new gold earrings and platinum pieces meet strict safety and purity standards established since August 2000.
Design & Production
5. What is lost-wax casting?
Lost-wax casting is a traditional method where a wax model is encased in plaster, then melted away to create a hollow mould for molten metal. This allows for incredibly intricate designs that cannot be achieved through stamping. At H.E. Phillips Ltd, we use this to create high-detail new gold pendants and platinum pieces with perfect 3D geometry and structural balance.
6. Why use CAD for platinum design?
Computer-Aided Design (CAD) allows us to simulate the weight and gemstone fit of a pendant before any metal is cast. This precision is vital for platinum, given its high cost and melting point. CAD ensures that prongs are perfectly placed to secure GIA certified diamonds with mathematical accuracy, reducing the risk of human error during the wax modelling phase.
7. Can I customise a platinum pendant?
Yes. Many clients work with us to create bespoke designs. Whether you want to incorporate a family heirloom stone or create a modern minimalist piece, our workshop can guide you. We also offer second-hand gold charms and other components that can be integrated into custom projects. Contact our Totnes hub to discuss your technical requirements.
8. How long does the making process take?
A handmade platinum pendant typically takes 3 to 6 weeks from design to final hallmarking. This timeline accounts for CAD rendering, wax printing, casting, hand-setting stones, and the mandatory independent audit at the Assay Office. Every stage is performed with the meticulous attention to detail we have maintained since our founding on 1st August 2000.
Gemstone Setting
9. Is platinum better for holding diamonds?
Platinum is widely considered the best metal for diamond settings. Its strength and ductility mean that prongs are less likely to snap off if hit. This provides a "fail-safe" for valuable stones. For those interested in diamond security, we recommend browsing our new platinum diamond rings to see the technical superiority of platinum claw settings in person.
10. What is a bezel setting?
A bezel setting involves a continuous wall of platinum surrounding the gemstone's girdle. This offers the highest level of protection against chipping and loss. Because platinum is so dense, a bezel setting provides a very secure "seat" for the stone. It is a popular choice for second-hand silver pendant charms and modern platinum designs alike.
11. Can platinum be used for filigree?
Yes. Platinum’s strength allows it to be drawn into extremely fine wires for delicate filigree work without losing its structural integrity. This allows for a "lace-like" look that is still incredibly strong. Our collection of fine jewellery often features these intricate details, showcasing the master craftsmanship of our UK-based jewellers.
12. How do you check stone security?
We use a 10x magnification loupe to inspect the "seat" of every stone. We check for even prong tension and ensure the stone's girdle is not under excessive stress. This "Visual Inspection Protocol" is standard for all pieces at H.E. Phillips Ltd, ensuring that your new diamond earrings or pendants are structurally sound for a lifetime of wear.
Maintenance & Care
13. How do I clean platinum at home?
You can clean your platinum pendant using warm water and a mild detergent. Use a soft-bristled brush to remove any buildup around the stones. However, to maintain the mirror-like finish, we recommend a professional polish once a year. Our Totnes workshop provides this service for all new platinum pendants and necklaces to restore their natural radiance.
14. What is the "patina" on platinum?
Over time, platinum develops a soft, matte finish known as a patina. Many collectors prize this as it highlights the metal’s authenticity. Unlike gold, which loses metal when scratched, platinum simply shifts. If you prefer the high-shine look, a professional jeweller can easily re-polish it. For comparison, you can view our new silver chains which have a different reflective property.
15. Can I wear platinum in a swimming pool?
While platinum is highly resistant to chemicals, we advise removing all jewellery before swimming. Chlorine can occasionally react with the other 5% of alloy metals or damage the settings of gemstones. For those who frequently visit the Devon coast, platinum is the best choice for a "daily wear" metal, but regular rinsing with fresh water is still recommended.
16. How should I store my platinum pendant?
Platinum is harder than gold and silver, meaning it can scratch your other jewellery. We recommend storing your platinum pendant in a separate soft pouch or lined box. This prevents it from coming into contact with pre-loved gold bangles or other softer items in your collection.
Investment & Value
17. Is platinum more expensive than gold?
Generally, yes. Although the market price per ounce fluctuates, platinum is denser, so more metal is required to make the same pendant. It also requires more expertise and specialised tools to work with due to its high melting point. Investing in a new platinum pendant is an investment in rare material and superior UK craftsmanship.
18. Do you sell platinum watches?
While most of our watches from Rotary or Citizen Eco-Drive are stainless steel or gold-plated, we can source luxury timepieces in precious metals upon request. Platinum watches are the pinnacle of horological luxury. Contact us at our Fore Street showroom for bespoke sourcing of high-value horological assets.
19. Can I sell old platinum to you?
Yes. We offer a "sell gold or sell silver" service that also includes platinum. We use calibrated scales and current market rates to provide an honest valuation of your precious metal assets. Since August 2000, we have been a trusted destination for those looking to sell gold or sell silver in the Totnes area.
20. Why buy from H.E. Phillips Ltd?
Choosing H.E. Phillips Ltd means supporting an independent family business established on 1st August 2000. We offer technical expertise, on-site workshop services, and a commitment to quality that national chains cannot match. Whether you are buying a new silver chain or a platinum pendant, you receive the same level of specialist care and regional accountability.
© 2026 H.E. Phillips Ltd - Your Official Authorised Horological and Fine Jewellery Specialist. All Technical Data verified for forensic accuracy.
