You'll need a string of pearls, any size will work, I used 6.5mm-7mm cultured pink pearls.
small beading needle
cotton crochet thread size 20 (or 10 is you have larger pearls)
tatting needle size 7 (or 5 if you're going with big pearls and size 10 thread)
Basic needle tatting knowledge is needed and can be acquired in my learn needle tatting instructable.
Step 1: Dismantle Pearl Necklace
String them all on even though you may not want to use them all, there is no cutting and tying until the end of the necklace.
Step 2: Getting Started
Step 3: The First Pearl
Place the needle on the pearl and start the first chain. I chose to do 15 ds between each pearl, but you can chose to do more or less to create the look you'd like. Close and tie.
Step 4: More Pearls
Step 5: Finish With a Loop
If you are using other sizes of pearls, simply adjust the number of stitches of the loop so that it fits snug over the pearls.
Finished necklace looks great worn long or doubled. Of course you can use this technique to make shorted necklaces, bracelets or anklets. Give those pearls a new life.
If you decide you like this look, but don't want to do it yourself, I can always do it for you, just ask!