I've bought from Blue Nile before. They're a big company and have reliable customer service. I wouldn't hesitate to buy from them. Also, they sell diamond jewelry (earings, rings, etc) with a certificate of appraisal. It has a closeup shot of the diamond(s), assessment of the color, clarity, cut, and and assessment of value. They also have an excellent
return policy. Here's a quote from their
product policies pageQUOTE
When you order a loose diamond, we ship it to you with the accompanying diamond grading report (also called a diamond certificate). These grading reports are created by diamond grading experts at one of two highly-respected diamond laboratories in a lengthy, laborious process — making it very expensive to replace a diamond grading report. Because of this, we require each diamond grading report to be included with each returned diamond.
If you do not include both the diamond grading report and appraisal with your return, you will be charged a replacement fee.
And on the same page, an answer to the laser inscription issue:
QUOTE
Many of our diamonds, such as those in our Blue Nile Signature Collection, are laser inscribed. If you find a diamond you'd like to purchase but it does not have a laser inscription, we recommend that you purchase the diamond and send it to a diamond grading lab where they can inscribe the diamond for you.
And another page about their diamond certification policies -
link