On mom's special day, surprise and delight her with this charming personalized birthstone necklace. Created in your choice of metal this design features the three to five dainty gemstones you select - each representing someone dearest to mom - glistening in a row along a polished cascading ribbon. This style suspends centered along an 18. 0-inch cable chain, adjustable to 16. 0 and 17. 0 inches, that secures with a spring-ring clasp.