Unlimited - Kendra Scott Jewellery.

US brand founded in 2002 by Kendra Scott offers such a wide variety of jewellery that this post can't cover even one tenth of their selection.

 

In general they have each piece in 3-4 different colors so that you can find the perfect version for every outfit. In some cases you can even choose the gem colors online from quite a big palette. Collections also range from classics to bridal jewellery (like in Elizabeth Cole - here) and include cocktail rings, statement necklaces with semi-precious stones, cuffs, bangles and stackable rings already stacked for you. Overall not expensive but some price tags certainly do bite.

For those wishing to have two same pieces in different colors - http://www.kendrascott.com/