Looking for an oval cut diamond at the blue nile website. What I noticed is that they do not supply anything better than very good cut. Will this diamond shine well? Does it seem like a quality diamond?
Sorry but there is no standardized cut grading and one cannot shop by numbers for ovals. You have to at the very least be able to see a picture of the actual diamond.
The only diamond shape that is graded for cut quality are rounds (GIA and AGL) and princess cuts (AGL only). For all other shapes, there is no standardized cut quality grading so anything you see on a vendor's website is the vendor's opinion, which often times do not list the criteria nor prove why it is graded as such.