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How to choose the right necklace length
Measure your neck.
Before purchasing a necklace, it's wise to first measure the circumference of your neck. This is especially true if you are considering buying a very short chain, like a collar or choker, since those styles are supposed to fit relatively tightly.
Wrap a soft measuring tape around your neck, holding it close to your skin. Make a mental note of your measurement and take it into account when selecting a length.