10kt 18"x3.5mm Hollow Figaro Chain paired perfectly with a 1" Diamond cut Heart shape Cursive Lined Matte Finish Initial Pendant. A classic look thats always in season.
Makes a beautiful and timeless gift for her. 
Note: Keep in mind, hollow chains will give you the look with less cost, but require care as mentioned in "How to Care" section. 
Choose your initial.