2010年10月11日星期一
Franck Muller Replica watches is mixed with palladium
Franck Muller Replica watches, the wedding ring was a plain band of yellow gold. But these days, rings are available in an ever-widening range of metals, and these metals can come in different purities. So what is the relationship between metal, quality, and cost?In its purest form, gold is referred to as 24 carat. This means it is 99.99% pure (jewellers call it the ‘Four Nines or ‘Fine Gold). Fine gold has a very rich and attractive yellow lustre, but it is a soft metal and unfortunately doesnt cope well with the everyday wear-and-tear that wedding bands suffer.To strengthen it, fine gold is mixed or ‘alloyed with other metals, typically copper and silver. Most high-quality wedding bands are alloyed to ‘18 carat, which means that they are eighteen parts pure gold out of twenty-four, or 75% pure. Gold is also frequently alloyed to 14 carat or ‘9 carat, or 58% and 37% pure respectively.Franck Muller Replica watches This makes it cheaper than ‘18 carat, but certainly with ‘9 carat this involves compromising the colour of the metal. All gold wedding rings should come with a ‘hallmark from an independent Assay Office, a stamp certifying exactly how pure the metal is. This is probably the oldest form of consumer protection, dating back to medieval times when debasing the coinage was punishable by death.These days, white gold is increasingly popular. This comes in the same categories as yellow gold (18 carat, 9 carat etc), but its fine gold component is alloyed with different metals – typically it is mixed with palladium and plenty of silver to turn it into a white metal. It is often finished with a thin rhodium plate, to get rid of the last hint of yellow. Alternatively, if fine gold is alloyed with a higher proportion of copper, the metal will end up with a rich pinkish tone – ‘rose gold.For tight budgets, titanium can be a good option. It an extremely strong white metal, which is also very light. At the other end of the price scale, platinum is the most rare and the most expensive of the metals used in wedding bands. It looks extremely similar to rhodium-plated white gold, but is denser. Its main advantage is that it is extremely durable, unlike rhodium plate, which wears off over time and needs to be replaced. Platinum is also an extremely popular choice for diamond-set Franck Muller Replica watches