Ideal Cut Diamonds

Representing only the top 3% of all diamonds, Ideal-cut diamonds dazzle with brilliance. This pinnacle of cut quality reflects most of the light that enters the diamond, radiating back a sparkle that will enhance any piece of jewellery. Shop our entire selection of Ideal-cut diamonds to find a traditional round diamond that makes a statement or a fancy-cut diamond with an effervescent personality.


24 of 167,081 Ideal Cut Diamonds

FAQs about Ideal Cut Diamonds

The cut grade is one of the 4Cs that determine the quality and pricing of a loose diamond. The cut grade refers to the facet proportions of the diamond. These proportions affect how light reflects in the diamond to create brilliance.

There are five different cut grades of diamonds, including Poor/Fair, Good, Very Good, Ideal, and Astor by Blue Nile™. However, you'll never find a Poor/Fair cut grade diamond sold at Blue Nile.

Yes. When it comes to round brilliant diamonds, the GIA uses the term "Excellent" for its highest cut grade. Blue Nile uses the term "Ideal" in exchange for the term "Excellent," but they are of the same cut quality.

Light reflects differently in every diamond. Light performance is measured by the GemEx BrillianceScope® Analyzer with spectrophotometer technology. Astor by Blue Nile™ diamonds are tested in this way.

Top Ideal Cut Diamond Reviews

Ideal Cut Round Diamond Review

Chose Perfect Criteria for Pure Brilliance!

I was able to choose all the perfect GIA criteria for a .73ct diamond with stunning brilliance! Ideal cut, F, VVSI, excellent symmetry, perfect table and depth ratios, no culet or fluorescence. Pics attached.
Audrey M. - Verified Buyer
Average Customer Rating $5 out of 5 stars
Double-Bail Solitaire Pendant Setting
18k White Gold

MOP 2,630.00

Ideal Cut Diamond Pendant Review

A great present!

I bought this for my girlfriends birthday and she absolutely loved it! I gave it to her just a week ago so I can’t speak to the durability at the moment but out of the box it looks great. I chose the ideal cut and it sparkles and shines beautifully! Great for the price especially. Very happy so far.
Harold C. - Verified Buyer
Average Customer Rating $5 out of 5 stars
Petite Bail Pendant
18k White Gold

MOP 2,430.00

Ideal Cut Diamond Engagement Ring Review


First time buying an engagement ring online. I was nervous at first. After looking at rings online and in store, I choose this one for my now wife! The ring is so beautiful that a picture doesn’t capture enough if it’s beauty. I choose the signature ideal cut from Blue Nile and it is by far more sparkly than any other diamond I’ve seen! I went with a .75 G colour, VVS1 diamond that is truly blinding in direct sunlight. I couldn’t be happier with my purchase. I know her friends are also jealous and she shows her ring off to everyone. Thanks again for the best service and extremely fast delivery!
Shawn A. - Verified Buyer
Average Customer Rating $5 out of 5 stars
ZAC ZAC POSEN Open Lace Floral Twist Diamond Engagement Ring
14k White Gold (3/8 ct. tw.)

MOP 15,775.00

now: MOP 7,900.00

Ideal Cut Oval Cut Diamond Review

Exceptional Engagment Ring

Quality ring. New fiancé said yes and kept getting compliments of how "shiny" the ring was. Staff at Bellevue mall location took the time to explain how things worked with Blue Nile as well as taking the time to answer all my questions. Staff was knowledgeable and above all patient with me in selecting a diamond and ring. Helped me ship to the store instead of my home to prevent fiancé from being tipped off. Would highly recommend using Blue Nile to anyone I know. Blue Nile helped me create a unique ring for my fiancé instead of one that looks like everyone else's from your typical brand name and generic jeweller.
Gerald H.
Average Customer Rating $5 out of 5 stars
French Pavé Diamond Engagement Ring
Platinum (1/4 ct. tw.)

MOP 14,050.00


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