Laser cut and inlayed with hypoallergenic surgical steel or gold-plated surgical steel 20in chain. Each come in a metallic blue box decorated with washi tape. 
 
Koa harvested from Kamuela Hardwoods in Waimea, Hawai'i.
 
Being a wood product there will be natural variation in shade and gradient with striations or other natural markings of the wood. The white in particular is the edge of the branch, and sometimes you'll get rare and stunning spalting depending on the piece. I cannot guarantee grain direction or coloration, but I promise when I'm spacing them out on given pieces I try to take these into visual consideration. The change in grain density between the colors makes little difference due to the finish.