You can stack them on a headpin, turn a loop in the top and put them on an earwire.
Another way is to string them on beading thread.
Start with one end strung through a clam or beading tip, string on the chips, put the thread through the bottom of the tip.
To finish I usually string the thread ends through a seed bead, tie a tight knot, add a drop of glue, close the tip and put on an earwire.
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Gemstone chip earrings by: ConnieG
Fire Mountain Gems has tons of ideas. Go to their Gallery of Designs and using the search feature for "earrings chips", you will arrive at this list of about two dozen ideas:
The switch knot is a decorative lacy macrame/ hemp jewelry knot that helps you save on twine too. This tutorial shows you how to tie one with clear pictures and instructions.
A sliding knot is a wonderfully easy way to end off a leather, string, hemp, or corded necklace or bracelet. It looks neat and stylish, is a very practical closure, and is very easy to make.