Blue Nile has a FAQ that answers most concerns. Call customer service via 1-800-242-2728 for 24/7 assistance. You can also communicate with them through live chat. Depending on your inquiry, you may send an email to any of the following addresses. For diamond questions, diamondexpert@bluenile.com; for jewelry questions, jewelryspecialist@bluenile.com; and for all policy-related questions, service@bluenile.com. You can also follow Blue Nile on Facebook, Twitter, Pinterest, and Instagram.