Pd is palladium, and 990 represents 990‰ gold content. Now it is 140 yuan/gram, which may be different in different regions.
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Palladium: (palladium)
It is a member of platinum group, silvery white, with symbol Pd, specific gravity of 12, lighter than platinum, stronger in ductility, slightly harder than platinum, and insoluble in organic acids, cold sulfuric acid or hydrochloric acid. But soluble in nitric acid and aqua regia. Under normal circumstances, it is not easy to oxidize and lose luster, and oxides will be produced on the surface around 400℃. If left in the air for a long time, it will turn gray, and palladium jewelry is generally rhodium-plated.
What is palladium?
Palladium: element symbol Pd, which is one of the platinum group elements. 1803 was discovered by British chemist wollaston when he was separating platinum. Similar to platinum, it has excellent characteristics, does not oxidize and lose its luster in the air under normal circumstances, and is an extremely precious precious precious metal resource.
Platinum —— "Noble House" in Metal
Palladium is one of the platinum metals. Platinum metals include ruthenium, rhodium, palladium, platinum, etc. Most of them are better than Huang Jingui, which is a typical metal "family".
What are the characteristics of palladium?
Palladium, a member of the platinum group, has the element symbol Pd, which is similar to platinum in appearance, silvery white metallic luster and bright color. The specific gravity is 12, which is lighter than platinum and has strong ductility. Melting point 1555℃, hardness 4-4.5, slightly harder than platinum. Chemical properties are relatively stable, insoluble in organic acids, cold sulfuric acid or hydrochloric acid, soluble in nitric acid and aqua regia, and it is not easy to oxidize and lose luster under normal circumstances.
Why is palladium suitable for jewelry?
Palladium has excellent physical and chemical properties, high temperature resistance, corrosion resistance, wear resistance and strong ductility. It can replace platinum in purity, rarity and durability, and is the most ideal material for making jewelry or setting gems alone.
Why is palladium the most attractive metal in jewelry?
Precious, pure and eternal!
Palladium is one of the rarest precious metals in the world, and its content in the earth's crust is about one hundred millionth, which is much rarer than gold. Only a few countries in the world, such as Russia and South Africa, produce less than 5‰ gold every year. Rarer than platinum. Palladium is extremely tough, and jewelry made of palladium not only has the natural and charming luster like platinum, but also can withstand the tempering of years and last as long as new. Palladium has almost no impurities, high purity and dazzling white light. The purity of palladium is also very suitable for skin and will not cause skin allergies.