From what Ive read about this company, the experience can be great or rotten depending on the sales assistent....same as T. too I guess, or any shop for that matter.
As long as you have some knowledge about diamonds beforehand, you should do alright there. But knowledge is the key. This would apply accross the board for buying anything.
Where they do set themselves apart in a huge way is there customer after sales service. I was very impressed to hear that they give the buyer 30 (or 60???) days to completely change their mind and get a full refund....not just credit!!!! Thats a pretty strong guarantee in your being satisfied!!!! Plus their upgrade policy is for the full amount of your purchase for the life of the business. And you do not have to spend double or anything like that, even one dollar more, I believe for loose stones.
You can get the diamonds graded by independent labs. but it is out of pocket to you. I believe their special range of premier diamonds are very nice going by buyers at pricescope who seem to know their diamonds!!!!