This coming March is my girlfriend and I 1 year anniversary for dating. I was planning to get her princess-cut diamond stud earrings. We are in college just so u know our age range. I have been looking at a pair of certified diamond stud earrings 1/3karat total weight 18k white gold for $399. SI2-I1 is clarity and H-I is color. She has never had diamond stud earrings before, her current pair are cubic ziconium stud earrings. Now she is 5''4 and 115lbs, so my questions is would 1/3 karat total weight be a good size for her to start off with?