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“Federal Trade Commission (FTC) guidelines for platinum jewelry state that only items consisting of 950 part per thousand of pure platinum can be marked stamped “PLATINUM” or “PLAT” without more alloy information. From 750-950 Platinum, the platinum group metals must also be indicated. For example, PLAT900IRID for 10% Iridium alloy. Historically, the most common alloys in America were 95% Platinum with 5% Ruthenium or 5% Cobalt and 90% Platinum with 10% Iridium. ”
Free sex video clip sites There is a misperception that the 950 platinum is better than the 900 platinum. However, pure platinum is very soft and the right alloy mix is what is important. Different alloys and different percentages produce better results for different jewelry purposes. Some alloy mixes work better for casting and some are better for handcrafting like bending the prongs over fragile diamond corners. Many artisans feel that PLAT900IRID is the best general-purpose alloy for diamond rings.
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Free hairy pussy video clip While platinum is best known for its use in jewelry, more than 60% of platinum is used for other industrial purposes such as catalytic converters in autos and pacemakers in the medical field. Because of its rarity and the rapidly increasing demand for this versatile metal, the price has soared in recent years.
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The high price of platinum has caused some jewelry manufacturers to start using lower percentages of platinum and to use other alloy metals to lower the cost of the jewelry. Unfortunately, these new alloy mixes are reducing the very qualities that made platinum desirable. The new alloys produce more brittle platinum that is more susceptible to damage.