Palladium Alloy Jewelry. I’ve emailed american elements for a quote but never heard back. Ruthenium, as well as other hypoallergenic and valuable metals, are mixed with the palladium alloy to increase hardness and uniformity.
Furthermore, these alloys have a grayish color; Palladium is a hypo allergenic, (rare cases of palladium allergies do exist), sturdy, long wearing and naturally white metal. A piece of palladium jewelry marked 500, for example, simply means that there’s 50% of the alloy is composed of palladium while 999 has a much higher purity level at 99%.