These necklaces are super popular- we have various charm sizing options- this is an 8mm diameter necklace. Includes charms sizing and chain. We have another listing for 15mm necklace as well that is our most popular selling necklace. 
This charm and necklace would be best for small engravings such as names, date, or fingerprint engravings.
We’ve added the option to just get the charm or purchase with the necklace
Once this size sells out we won’t be bringing more in. The 15mm is definitely most popular