I just received these and they are definitely not London blue (very dark blue). They are, however, a very nice medium blue, exactly the color I think of as "blue topaz". I read many reviews of blue topaz jewelry on Amazon and the consistent theme was "these aren't as dark as they look online". Having read that same phrase many dozens of times I decided to order a darker color than I wanted and hope for the best. It worked. These are just what I wanted, a bright medium blue- the color usually called Swiss blue. If you want that classic blue topaz color you can buy these with confidence.