I purchased this for my girlfriend for Valentine's Day and she really enjoyed it. I agree with the other review, the chain is a bit dinky and you'll probably want to get something more durable to wear or be fairly careful with it.
For the price, I thought it was a pretty great deal considering most the necklaces I found in the price range (~$150 or less) are very tiny or they use (lab) "created" sapphires; this necklace uses naturally occurring (real) sapphires. Maybe you don't care if they're lab created or real, but I did and that helped decide my purchase.
In my opinion, this necklace is also in the small-medium size range and is visible from some distance unlike some of the others I looked at which would hardly be visible even at a 2-3 ft distance. Take careful note of the sizes of these items as they can be a bit deceiving if you're not attentive.
I'm also definitely not a gemologist, but I did notice a slight bit of difference in clarity/color in some of the sapphires. Some seemed almost noticeably darker than the others. This might be common with natural sapphires or gemstones and as this necklace contains 7 gemstones, I can imagine some variability isn't out of the question.
Overall, I consider this a good purchase and worth the price. I'm giving it 4/5 mainly due to the chain thickness.