Choosing coloured background for photos

I have always had difficulty when photographing some of my jewellery to find a suitable coloured background to show the piece to its best advantage. White has been a particular problem. 
This is an easy solution, I found quite by chance, that might be helpful.
Last Christmas I bought a book of assorted coloured card, actually for making cards, I took all the colours that I thought might work with white or crystal jewellery, and made photos, this is the result.... the photos themselves are not the best, but it gives a good idea of what does and doesn't work, and is easy to keep on your desktop for future reference. 

And this is the colour I choose