Hello, my boyfriend and I are looking on Blue Nile at Oval diamonds around the 1.5 ct range. I was wondering if you could help me compare a few different diamonds and guide me in the right direction! Here is one of the diamonds I am looking at [link below]. I am also trying to decide if we want fluorescence. Any tips? ~ Tricia B.
Note: Blue Nile changed the format of how deep links were created when they switched their affiliate network from GAN to CJ, and thus the original links to the following diamonds were broken and have been replaced with links directed to their diamond search engine, which is fine since these options have probably sold by now. Please use my free Diamond Concierge Service if you would like me to help you find the best options currently available, but the information that can be obtained by reading the article is still applicable even if the diamond details pages can not be accessed.
Thank you for your inquiry Tricia. So the challenge with fancy shape diamonds, such as the oval brilliant, is that the GIA only provides the total depth and table diameter measurements. As you can see from the lab report provided to the left, measurements are not provided for the crown angle or pavilion angle. These are critical measurements since they essentially dictated the volume of light, or light return that the diamond will exhibit. Blue Nile does not routinely provide this type of detailed information either, therefore under normal circumstances, the only thing that I would be able to tell you about the 1.51 carat, G-color, VS-2 clarity, oval which is offered by Blue Nile is that the excellent polish and very good symmetry rating is a pretty good start for a fancy shape diamond.[separator]
It’s a pretty good start because I can tell from the measurements of the diamond provided on the lab report, which indicate that the diamond measures 9.28 x 6.52 x 3.99 millimeters, results in a length to width ratio of 1.42:100 [stated as 1.42 to 1.00] which gives the diamond a nice outline. Most diamond experts would likely agree that a length to width ratio somewhere between 1.33:1.00 and 1.66:1.00 is their preferred range, so 1.42:1.00 is pretty much right in the middle. And the 59.3% table diameter is a good offset for the 61.2% total depth measurement.
The total depth and table measurements are representative of a diamond which has the potential to be quite nice, but without knowing how much of the total depth is comprised of the crown and pavilion sections, it’s like looking at the silhouette of a tree and trying to identify the type of tree based solely upon the outline and leaf structure… we might guess correctly some of the time, but we’re also going to be wrong sometimes. The only way to judge a diamond for light performance is have all the pieces of the puzzle in terms of the proportions and overall cut quality, so I contacted my rep at Blue Nile and asked for a computerized proportions analysis of the diamond.[separator]
Pictured to the left are the results of the Sarin computerized proportions analysis of the 1.51 carat, G-color, VS-2 clarity, oval brilliant from Blue Nile. This information not only provides us with the (average) crown angle of 34.6° and pavilion angle of 41.1° but also provides us with the full range of high and low measurements which the average measurements are based upon. So we know that the crown angle measurements range from a low of 33.2° up to 35.4° and the pavilion angle measurements range from 32.3° up to 41.1° which at first glance might seem kind of wonky, but keep in mind that every facet is a slightly different size and cut to a different plane because the oval shape is not perfectly symmetrical, like a round brilliant cut diamond would be. Ah now it makes sense…[separator]
If you’ve spent any time on the Blue Nile web site, you know that they also don’t routinely provide photographs of the diamonds… Here again, sometimes it’s a matter of who you know and what their mood is… As you can see from the picture of the diamond featured to the left, it’s a pretty good looking stone! I think that they might have washed it out a bit by not knowing what they were doing in terms of balancing the light while photographing it, but I think it’s going to have nice contrast based upon what I see in the upper half of the picture… I’m thinking that the light source was closer to the lower half of the diamond and washed it out, but hey, at least they took a picture for us!Since I don’t like buying diamonds without having all the pieces of the puzzle, I sent an email to my representative at Blue Nile and obtained a photograph of the diamond and a computerized proportions analysis, which is pictured to the left.[separator]
I looked over the high resolution copy of the diamond grading report which is available via the GIA report check feature, and everything looks good. There are a couple of small feathers and diamond crystals, in the form of crystals, clouds (clusters of pinpoint size diamond crystals), and needle shaped diamond crystals, nothing that concerns me. So I’d say this is a good option in terms of Blue Nile Oval Diamonds.
Todd Gray is a professional diamond buyer with 30+ years of trade experience. He loves to teach people how to buy diamonds that exhibit incredible light performance! In addition to writing for Nice Ice, Todd "ghost writes" blogs and educational content for other diamond sites. When Todd isn't chained to a desk, or consulting for the trade, he enjoys Freediving! (that's like scuba diving, but without air tanks)
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