Brian Gavin Signature Princess vs Blue Nile Signature Princess cut diamonds

By Todd Gray

September 25, 2015

Blue Nile Signature Princess, Oval, Round Diamond Rings.

Popular Shapes of Blue Nile Diamonds

"Please tell me the differences between Blue Nile Signature Princess cut diamonds and Brian Gavin Signature Princess cut diamonds. Specifically, I would like a comparative analysis of these two: 1.90 carat, G-color, VS-2 clarity, Blue Nile Signature princess cut diamond, vs. 1.930 carat, G-color, SI-1 clarity, Brian Gavin Signature princess cut diamond."

Please tell me which of the two princess cut diamonds has the best proportions. Can you tell me which signature princess cut diamond you would purchase. These seem to be the best ideal princess cut diamonds that I can find. The weight is just under the 2-carat mark where prices seem to increase substantially." ~ Thatcher T.

Note that this client ended up purchasing a Brian Gavin Signature Cushion cut diamond. His girlfriend chose that option after a discussion about diamond shapes. So these two diamonds are available!

Brian Gavin Signature vs Blue Nile Signature Princess:

I’m certain that both of the diamonds are beautiful. However, I personally prefer the 1.931 carat, G-color, SI-1 clarity, Brian Gavin Signature Princess cut diamond.

That’s because it features a three chevron facet structure on the pavilion. The three chevron facet structure is going to produce sparkle that is larger in size.

It will also be bolder, brighter, and more vivid than the smaller sparkle from four chevron facets. This is of course largely a matter of personal preference.

Blue Nile Signature Princess Cut Diamond Review:

Blue Nile Signature Princess Cut Diamond Review.

Blue Nile Princess Cut Diamonds.

The 1.90 carat, G-color, SI-1 clarity, Blue Nile Signature Princess cut diamond features a four chevron facet structure on the lower half of the diamond. I recommend reading about The Effect of Chevron Facets upon Light Performance in Princess Cut Diamonds for additional insight on this subject.

However the basic premise is that a higher number of chevron facets results in the light being broken up into smaller and smaller pieces. The challenge with sparkle that is smaller in size is that our human eyes can experience difficulty dispersing the light into the colored flashes of light known as dispersion or fire.

Thus princess cut diamonds that feature four or five chevron facets, often appear to exhibit more brilliance (white sparkle). They might even seem icy in appearance ~ which some people like. However, I prefer a balance of brilliance and dispersion, and sparkle that is larger in size, and bolder in appearance.

Essential Crown and Pavilion Measurements:

ASET for Princess Cut Diamond

ASET for Brian Gavin Signature Princess Cut

One thing that you want to take note of with princess cut diamonds graded by the GIA is that the diamond grading report does not provide the crown height or pavilion depth measurements.

That means that you don’t really know how the upper and lower halves of the diamond are divided. Thankfully this information is provided in the supplementary GCAL report.

In this particular instance, the crown height of the diamond is 10.9% and that is sufficient. The optical brilliance analysis indicates that the diamond is returning a high volume of white light.

However, it is clear from the images provided that the pattern of light return is not evenly distributed throughout the diamond. This however is pretty typical of princess cut diamonds.

Even those that receive a symmetry grade of GIA Excellent or AGS Ideal-0 because most diamond cutters fail to polish the facets of the diamond evenly and on the same plane.

ASET for Princess Cut Diamonds:

Blue Nile vs. Brian Gavin Signature Princes

Brian Gavin Signature Princess Cut Diamond.

If we look at the clarity photograph, ASET Scope image, and Ideal Scope image provided for the 1.930 carat, G-color, SI-1 clarity, Brian Gavin Signature princess cut diamond. It’s apparent that the pattern of light is rather evenly distributed throughout the diamond.

The diamond grading report issued by the AGS Laboratory also features an ASET image. It indicates that the diamond is going to be incredibly bright,. It also that the light is evenly distributed. This is represented by the colors red, green, and blue.

Those colors represent different intensities of light present within the test chamber. It also shows the degree of contrast being exhibited by the diamond. This article will further explain what the different colors of an ASET image mean.

Note that the diamond grading report issued by the AGS for a princess and other fancy shape diamonds provides complete insight into the proportions of the diamond.

 It is not necessary to supplement a diamond grading report issued by the AGSL with additional proportions analysis. The light performance-based ASET analysis also provides a clear insight into how effectively the diamond is making use of the light available to it from within the room.

Blue Nile vs. Brian Gavin Signature Princess Winner:

Custom Engagement Ring Brian Gavin Signature Princess Cut Diamond.

Custom Brian Gavin Princess E-ring.

It seems to me that the decision to purchase a Brian Gavin Signature Princess cut diamond over a Blue Nile Signature Princess cut diamond, or vice versa comes down to a matter of whether you prefer sparkle that is larger and bolder or smaller and icier.

I know that I'm partial to broad-spectrum sparkle that is larger in size. However, you might prefer a sparkle that is smaller in size, both are excellent options The reality is that every diamond should be considered on its own merits.

Earlier versions of Brian Gavin Signature Princess cut diamonds may have featured a variable number of chevron facets. However, his ongoing research into light performance led to the conclusion that three chevron facets produce the best sparkle factor.

Princess cut diamonds can be a bit trickier to choose than round brilliants. In that case, you should take advantage of my free Diamond Concierge Service. I'll look at the options available and let you know which diamond I would buy personally.

Todd Gray

About the author

A mad scientist with a passion for improving diamond cut quality to maximize light performance and sparkle factor. I speak geek in degrees of optical precision between bouts of freediving. My ghostwritten ramblings haunt the rabbit holes of information found on many diamond vendor sites. Diamond buyer, author, consultant, errant seeker of deep blue water.

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