EXHIBIT 23.1 CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM We hereby consent to the incorporation by reference in the Registration Statement on Form S-8 (No. 333-115700) of Blue Nile, Inc. of our report dated March 25, 2005 relating to the financial statements and financial statement schedule, which appears in this Form 10K. /s/ PricewaterhouseCoopers LLP Seattle, Washington March 25, 2005