For sale is a brand new, never used, genuine and authentic: 
David Yurman 8mm Petite Infinity Birthstone Necklace in Aquamarine, Diamond, and Sterling Silver
-It lists for $450
-Approximately 17" long tiny box chain in sterling silver that can be worn at 15" 16" or 17"
-8mm pendant with aquamarine and 0.084 CTW diamonds
-Aquamarine is the birthstone for March birthdays
-Marked with "(C)D.Y. 925" on the back of the pendant and on a tag near the lobster claw lock
-The necklace comes in a David Yurman gift box with a certificate of authenticity.
-US customers: I ship for free with USPS priority mail and offer express shipping for $30