Which is the range of white gold
Gold / silver / platinum
Gold, silver and platinum - precious metals that adorn.
The precious metals gold, silver and platinum adorn perfectly. But what exactly is in the jewelry, what do the fineness, plumb bob or carat mean? And how are the prices for the “raw material” that jewelry and watch dreams are made of? The following overview is intended to give a brief introduction to the basics of precious metals.
Gold, aurum (Latin), chemical symbol Au, atomic number 79,
Melting point 1,064 ° C, density 19.32 g / cm³, weight is often given in grams
or ounce (1 ounce = 31.103479 g) or kilogram bar.
No “pure” gold is used in the manufacture of jewelry and watches, as it is too soft. Adding other metals (alloying) makes the gold harder. By using different metals for the alloy, different gold colors are achieved: silver and copper for yellow gold and red gold (high copper content), palladium for white gold. High-quality jewelry has a fineness of 585 or 750. The fine gold content is specified in per mille (fine gold content in thousandths), traditionally also in carats (24 carats = fine gold 999/000 or 1000/1000).
|Fine gold content||carat|
Platinum (English platinum), platina (Spanish), chemical symbol Pt,
Atomic number 78, melting point 1,768 ° C, density 21.45 g / cm³.
The precious metal is processed into jewelry with a fineness of 95% (fineness 950/000), indicated as Pt 950. Alloys such as Pt 585 and Pt 750, which impress with their special material properties, are also relatively new in the jewelry sector. Compared to other precious metals such as gold and silver, platinum is rare, hard and also demanding in terms of working and processing due to its high melting point.
Silver, argentum (lat.), Chemical symbol Ag,
Atomic number 47, melting point 962 ° C, density 10.49 g / cm³.
Like other precious metals, silver is not attacked by oxygen, but by the hydrogen sulphides in the air. This leads to a discoloration (colloquially tarnishing) in yellow-brown to blue-black. The tarnishing of silver (and other alloys such as white gold) can be prevented by rhodium plating, the galvanic "coating" with a rhodium layer, or at least delayed for a long time if the surface is subjected to mechanical stress. The fine silver content is given in per mille (fine silver content in thousandths), traditionally also in lot (16 lot = fine silver 999/000, 12 lot silver = 750/000, 10 lot silver = 625/000, etc.). In the jewelry sector today, fineness of 800/000, 835/000, 900/000 and the very often used so-called “sterling silver” with 925/000 are common.
All statements without guarantee.
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