Platinum is one of the rarest and most valuable precious metals, prized for its durability, hypoallergenic properties, and resistance to tarnish. Whether you’re buying jewelry, investing in bullion, or collecting coins, understanding platinum purity levels is essential. Platinum purity is measured using millesimal fineness (‰), which indicates the percentage of pure platinum in an alloy.
What Is Platinum Purity?
Platinum purity refers to the amount of pure platinum in a given item. Since platinum is a very dense and durable metal, it is often mixed with small amounts of other metals like iridium, palladium, or ruthenium to improve its workability and strength.
Platinum purity is expressed in millesimal fineness, which represents the number of parts of platinum per 1,000 parts of the alloy. For example, a fineness of 950 means the item is 95% pure platinum.
Complete Platinum Purity Chart
| Millesimal Fineness | Platinum Purity (%) | Common Uses |
|---|---|---|
| 999 – 1000 | 99.9% – 100% | Investment-grade platinum, bullion |
| 950 | 95.0% | High-quality jewelry, premium watches, medical implants |
| 900 | 90.0% | Fine jewelry, some industrial applications |
| 850 | 85.0% | Durable jewelry, limited use in some markets |
| 800 | 80.0% | Industrial applications, older jewelry |
| 750 | 75.0% | Mixed-metal jewelry, specialty items |
| Below 750 | <75.0% | Rarely used in jewelry, mainly for industrial purposes |
Which Platinum Purity Is Best?
The ideal platinum purity depends on the intended use:
- 999+ Platinum: Ideal for investment and bullion, but too soft for jewelry.
- 950 Platinum: The most common and highest-quality standard for jewelry, offering excellent durability and purity.
- 900 Platinum: Durable and still considered fine platinum, often used in jewelry and watches.
- 850 Platinum: More affordable but slightly less pure, used in some jewelry and industrial applications.
How to Identify Platinum Purity
Platinum items are typically marked with a hallmark indicating their purity. Common markings include:
- “999 Pt” for fine platinum
- “950 Pt” for high-purity jewelry
- “900 Pt” for fine platinum jewelry and industrial use
- “850 Pt” for more affordable platinum jewelry
If you are unsure about an item’s purity, you can verify it using acid tests, electronic testers, or by consulting a professional jeweler.
Final Thoughts
Understanding platinum purity ensures that you make informed choices when purchasing or investing in this rare and valuable metal. The higher the fineness, the purer the platinum, but also the softer it becomes. Whether you’re buying jewelry, coins, or industrial-grade platinum, knowing the purity levels will help you select the right product.
Looking for high-quality platinum products? Always check the purity stamp before making a purchase!
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