Due to the rhinestone detail, these collars are NOT adjustable and will be made to order according your requirement. Please measure your dogs neck carefully allowing room to ensure the collar is comfortable. Please note, these are not actual crystals, or stones, but faceted indentations which gives the appearance of a crystal, and just as sparkly! This has the advantage that no individual stones will fall off or come loose. 

The collars are 1.5" wide, the martingale loop is 1 inch.  The D-rings are 4mm thick and welded for safety. The collars also lined for your dogs comfort.