This Beautiful Cross Necklace does it all. You can choose you chain length and if you want it to change colors, just add to drop down box. Easy as 1,2,3. 
This cross glows heavenly in the dark. Just charge it in the sunlight. If you choose the change your colors option, the cross will change from white to purple. Both styles glow. 

Cross size:
Cross Material: Stainless Steel
Chain length: 16",18" 20" Choose in drop down box
Color Options: White or Change your Colors Purple