Platinum has long been associated with luxury and permanence, making it the metal of choice for heirloom-quality engagement rings and fine jewelry. PT950 — the standard platinum alloy containing 95% pure platinum — offers unique properties that distinguish it from gold and silver.
What Is PT950?
PT950 means the alloy is 95% pure platinum with 5% other metals (typically ruthenium, iridium, or cobalt) added for hardness and workability. The "PT" stamp and "950" fineness are legally required marks for platinum jewelry in most countries. Other common platinum alloys include PT900 (90% platinum) and PT999 (99.9% pure, too soft for most jewelry).
Key Properties of Platinum
| Property | PT950 Platinum | 18K White Gold | 925 Silver |
|---|---|---|---|
| Purity | 95% Pt | 75% Au | 92.5% Ag |
| Density (g/cm³) | 21.45 | 15.5-16.5 | 10.4 |
| Hardness (HV) | 110-130 | 120-160 | 60-70 |
| Melting Point | 1772°C | 900-1000°C | 890°C |
| Hypoallergenic | Excellent | Good (rhodium) | Good |
| Tarnish | None | Needs rhodium | Tarnishes |
| Price (per gram) | $30-45 | $55-70 | $0.80-1.20 |
The Density Advantage
Platinum is approximately 60% denser than gold, meaning a platinum ring of the same dimensions will feel significantly heavier and more substantial. This weight is often perceived as a mark of quality and luxury. A typical platinum engagement ring setting weighs 6-10 grams, compared to 4-6 grams for the same design in 14K gold.
Naturally White — No Plating Needed
Unlike white gold, which is actually yellowish-white and requires rhodium plating to achieve a bright white appearance, platinum is naturally white and stays that way permanently. There is no need for periodic re-plating, making platinum lower-maintenance over the lifetime of the piece. This is a significant long-term cost saving.
Hypoallergenic and Biocompatible
Platinum is one of the most hypoallergenic metals used in jewelry. Its 95% purity means very little alloy metal, and the alloys used (ruthenium, iridium) are themselves inert and non-reactive. Platinum is the safest choice for people with metal sensitivities and is even used in medical implants and dental work.
Durability and the Patina Effect
Platinum is extremely durable but in a different way than gold. Rather than scratching and losing metal (like gold), platinum develops a soft, satiny sheen called "patina" over years of wear. This patina is highly prized by platinum enthusiasts as a sign of authentic wear and character. Platinum is also more ductile than gold, making it ideal for intricate prong settings that securely hold gemstones.
Pricing: Understanding the Premium
While platinum's per-gram spot price may be lower than gold at times, platinum jewelry is typically more expensive because: (1) it is denser, so more metal is needed for the same piece; (2) it requires higher temperatures and more specialized equipment to cast and work; (3) the 95% purity standard means more precious metal content.
| Item | PT950 Platinum | 18K White Gold | 14K White Gold |
|---|---|---|---|
| Simple band (5g) | $400-600 | $300-450 | $200-320 |
| Engagement setting | $1,200-2,500 | $800-1,500 | $500-900 |
| Pendant (3g) | $250-400 | $180-300 | $120-200 |
Care and Maintenance
- Platinum does not tarnish — no special storage needed
- Clean with warm soapy water and a soft brush
- Ultrasonic cleaners are safe for platinum
- Polish with a jeweler's cloth to restore shine if desired
- Patina is natural and desirable — do not over-polish
- Have prongs checked annually for wear
Frequently Asked Questions
Is platinum better than white gold for engagement rings?
Platinum is generally considered superior for engagement rings because it is naturally white (no re-plating needed), hypoallergenic, denser/more substantial, and develops a beautiful patina. White gold is more affordable and can be equally durable but requires periodic rhodium plating.
Does platinum scratch easily?
Platinum does scratch, but unlike gold, it does not lose metal when scratched — the metal simply displaces. Over time, this creates a desirable patina. Platinum is actually more durable than gold in terms of long-term wear and prong security.
Why is platinum more expensive than gold?
Platinum jewelry costs more because platinum is 60% denser than gold (more metal per piece), requires higher temperatures to cast (more energy and specialized equipment), and uses 95% pure metal vs 58-75% for gold alloys.
What is platinum patina?
Patina is the soft, satiny sheen that develops on platinum over years of wear. Unlike gold, which loses tiny amounts of metal when scratched, platinum metal simply moves, creating a smooth, matte-like surface that many consider a mark of authentic, well-loved jewelry.
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