I have just started out as a Stella & Dot Stylist. And at the Trunk Shows I have had I noticed that while most people are in love with all the bold statement necklaces the first thing I hear (after wow I love this) is “How do I wear it?”
A by product of being big, bold and sometimes colourful, the statement necklace can come off as being intimidating to style. 
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Pictures via Pinterest (stylespotting.com, theyallhateus.com, cupcakesandcashmere.com)

Realistically a statement necklace can just be thrown on, just like anything else. But if you are looking to put a bit more thought into it 
here are some tips:

1. Keep your top, blouse or dress simple. A colourful statement necklace is almost like a pattern all its own. The most sure-fire way to have your necklace pop is to pair it with a plain white tee or blouse. 

2  Statement necklaces made of metals or crystals are more neutral (the colours aren’t going to clash with anything) so you can pair them with prints, stripes, or try a tone on tone look. 

3.  Keep the neckline of your top or dress unadorned. That means no lattice work, beading or details that might already be mistaken for a statement necklace.

4.  Just like mixing prints, you can wear a bold necklace with a bold top. If you are wearing colourful beads or semiprecious stones, pick a necklace that is made of colours that are already seen in the print. 
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Images via Pinterest (brillmagazine.com, anewfoundtreasure.com, dailymail.co.uk)