Personalized Faux Rhinestone 21st Birthday Women's V-Neck T-Shirt. 21st birthday Women's V-Neck T-Shirt - Black with a shimmering, glittering, sparkling, silver, FAUX rhinestone number 21. Perfect for her 21st birthday! 5.0 oz., 100% pre-shrunk cotton Athletic Heather is 90/10 cotton/polyester 1x1 rib collar with mitered v-neck Shoulder-to-shoulder taping Ladies' fit