add-a-diamond

[skphotoimages]

Can anyone point me to a site that has Add-a-diamond necklaces. I want the kind that every link is a round (or square) solid "block" the jeweler simply snaps off the solid cover and sets a diamond. I can find one site with bracelets, but no luck with necklaces. i want white gold, but I''d love to see either color gold for the time being. Here is a picture of the bracelet example.
Thanks!