Buying an engagement ring, like a house or a car are major investments that will give great pleasure. To answer the question of how much a diamond would cost at Harry Winston, go in and ask. You don't have to buy. Of course, they offer more than an online store. Of course it will cost more, but go in and find out the difference. HW, Tiffany, etc. are still in business not because they overcharge. They do provide a knowledgeable staff who have experience in showing diamonds. They will make the experience fun and interesting, as will any good jewelry store. Also, you can get a glass of champagne, or espresso, or both!