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[Seite 8] - carat clearly arranged and informative working with precious stones metals and pearls ... diamonds for one person they are the expression of love ... of diamonds in the catalouge starting on page 242 4c the properties or the value ... gelb gelblich schwach gelblich getöntes weiß schwach getöntes weiß weiß feines ... weiß blauweiß braun getönt phantasiefarbe colour abbreviation y ly ...
[Seite 9] - sind jedoch weich und dehnbar somit können sie gut bearbeitet und entsprechend geh ... 255 gold silver and platinum precious metals are particularly resistant to acids ... salts the precious metal gold e.g can only be dissolved by a mixture of nitric and ... hydrochloric acid and silver only by oxidising acids gold has already ... c in ancient times as well the precious metals gold and silver were used as ornamental ... the difficulties in melting it platinum only became important in the century before ... last metals from the platinum family are mercury ... palladium and platinum like gold these metals do not create oxides when exposed to ... air all three precious metals are however soft and stretchable so ... for artificial deformations creative working using precious metals and the suitable ...