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Why Use Platinum-Cobalt Alloy? Stuller

    https://www.stuller.com/articles/view/why-use-platinum-cobalt-alloy/
    For example, this Pt-Co alloy was developed more than 20 years ago and has been used extensively in Europe and Japan for jewelry. It’s not new, and it was developed specifically to perform better in jewelry casting than either Platinum-Iridium (Pt-Ir) or Platinum-Ruthenium (Pt-Ru).

Platinum Alloy Applications for Jewelry - Ganoksin Jewelry ...

    https://www.ganoksin.com/article/platinum-alloy-applications-for-jewelry/
    The most common alloys in the United States are 950% Platinum with 50% Ruthenium or 5% Cobalt, and 90% Platinum with 10% Iridium. Platinum / Iridium Systems Iridium is one of the PGM’s. It. has a face centered cubic structure and when added to platinum in small quantities it will effect its hardness.

Cobalt Jewelry Education: About, Care, and Buying Tips ...

    https://www.bluenile.com/education/metal/cobalt
    Made from a highly durable alloy, cobalt is four times harder than platinum while at the same time, less dense. Because of its natural hardness, cobalt jewelry is extremely scratch, chip and corrosion-resistant. Its lower density and natural malleability allow for strong, dynamic designs with less weight.

Should I Buy a Cobalt Ring? A Complete Guide Jewelry Guide

    https://www.jewelryshoppingguide.com/cobalt-men-wedding-ring-guide/
    Cobalt and Its Alloys Cobalt is a transition metal, similar to metals such as tungsten, platinum or silver. Cobalt, in its pure form, cannot be used in jewelry. As a result, cobalt is alloyed with other metals to make it stronger, more malleable and more wearable.

FTC Revises Jewelry Guides to Reflect the Use of Base ...

    https://www.ftc.gov/news-events/press-releases/2010/12/ftc-revises-jewelry-guides-reflect-use-base-metal-alloys-platinum
    Dec 16, 2010 · It explains that while traditionally platinum jewelry contained 85 to 95 percent pure platinum alloyed with other precious metals, in recent years, some platinum pieces have been alloyed with a larger percentage of non-precious metals, such as copper and cobalt.

Platinum Purity - Mark Morrell

    http://www.mwmjewelry.com/platinum_purity.htm
    This alloy works extremely well for casting. This metal polishes quickly because polishing is "abrasion" and the alloy doesn't resist abrasion as we'd otherwise expect platinum to do. This alloy features a natural "bluish" color cast due to the high volume of cobalt. Rhodium plating is …

Platinum Antique Jewelry University

    https://www.langantiques.com/university/platinum-2/
    Most platinum alloys used for jewelry contain 85%-95% platinum. Common additives are palladium, iridium, ruthenium, cobalt or copper. What additive and ratio is used largely depends on what the goldsmith wants to do with it.

4 Ways to Identify Platinum and Silver Jewelry - wikiHow

    https://www.wikihow.com/Identify-Platinum-and-Silver-Jewelry
    Feb 05, 2020 · Cobalt, which is quite hard, is becoming popular as a platinum alloy. Because cobalt is slightly magnetic, some platinum jewelry may react to a magnet. Platinum/cobalt alloys will usually be stamped as PLAT, Pt950, or …Views: 609K

What Metal Jewelry is Hypoallergenic?(18 Metals Explained ...

    https://www.afashionblog.com/what-metal-jewelry-is-hypoallergenic/
    These metals that can be added are such like nickel, copper, chromium, rhodium, stainless steel, platinum, palladium, zinc among a few others. Copper and nickel are potentially the most non-hypoallergenic metals to alloy with as they are reactive to certain skin and atmospheric conditions.

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