This is one on my favourite jewellery makeovers; I had a very small pretty choker style necklace with a beautiful bow with white seed pearls and marcasite that did not suit me and languished for years in a jewellery box. One day I found some long strings of glass pearls in the same hue as the seed pearls on my bow. I bought all 3 necklaces and made over the necklace. I used all three strands and 6 clamshell bits to hide the knots and give a finished look.
There is a very nice accessories shop that I visit where something similar can cost several hundred $s. So I was really pleased with my new necklace. I usually wear this with a plain top to look polished.  The finished length is about 34 inches.