Thu, 22 Sep 2011, 9:55pm งานสัมมนา CEO Forum “Thailand Green Competitiveness and Re-branding“ »
bartzlqd@hotmail.com
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Registered: Sep, 2011
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Pure silver is not used in the manufacture of silver jewelry because it is too soft. Silver jewelry usually contains alloys because they are harder and resist tarnishing much better than pure silver. The silver alloy that most people are familiar with is sterling silver

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