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Ideal Cut Diamonds

Ideal cut diamonds are precisely proportioned to reflect the maximum amount of light, creating a brilliant, fiery appearance.

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An ideal cut diamond is a diamond that is cut to ideal proportions and features excellent polish and symmetry grades on the GIA cut, color, and clarity scale. Ideal cut diamonds are considered high-quality diamonds that out-rank the majority of other diamonds in their ability to shine brilliantly and reflect light.


When considering an ideal cut diamond, it is imperative to also consider the other 4 Cs: color, clarity, and carat. While having ideal status is important, it is equally important to find a diamond that retains an excellent level of clarity (little to no inclusions), is within a color scale that you like (generally D-H), and is a carat weight that fits within your preferences. When you find an ideal cut diamond that is equally well-ranked across categories, your stone will truly be a cut above the rest.

Ideal cut diamonds are available across a wide range of carat weights in Brilliant Earth’s inventory, from under 0.3 carats to multiple carats and larger. You can find options for delicate solitaires up through show-stopping stones for statement settings.
The Ideal Cut collection includes round and many fancy shapes such as oval, emerald, cushion, pear, radiant, princess, marquise, asscher, and heart. Brilliant Earth lists ideal cut options across these popular shapes to suit different ring styles.
Use filters for shape, carat, color, clarity, cut grade, length-to-width ratio, fluorescence, report lab, and price to narrow Ideal Cut diamonds on the site. Filtering by L:W ratio or report lab is especially helpful for finding specific proportions and documentation.
Ideal Cut diamonds at Brilliant Earth span a broad color range, commonly from D through J, and clarity grades from Flawless and Internally Flawless through VVS, VS, and SI grades. Filter the collection to see the specific color and clarity combinations currently in stock.
Yes, each Ideal Cut diamond includes an independent grading report from recognized labs such as GIA, IGI, HRD, or GCAL that details carat, color, clarity, cut, and other key measurements. View the diamond’s report on its product page for full specifications.
Even with the same grade labels, diamonds can differ in exact proportions, table and depth percentages, polish, symmetry, fluorescence, and length-to-width ratio, which affect face-up appearance. Those subtle measurement differences are why viewing multiple photos and the grading report helps compare stones.
Yes, many Ideal Cut diamond listings include multiple photos, close-up images, and 360-degree or video views so you can examine proportions and facet detail. Look for real-view images and measurement data on each diamond’s page.
Yes, you can add an Ideal Cut loose diamond to an engagement ring. A Brilliant Earth jewelry specialist can help match the diamond to compatible settings and guide the next steps to set it in a ring.
An ideal cut diamond is cut to precise proportions, polish, and symmetry to maximize light return and sparkle, making it an excellent choice for brilliance. Brilliant Earth’s Ideal Cut collection focuses on stones with those optimized proportions for exceptional fire and scintillation.
Length-to-width ratios vary by shape and personal preference; common ranges include princess 1.00–1.05, radiant 1.00–1.05, asscher 1.00–1.05, cushion 1.00–1.05, elongated cushion 1.20–1.49, heart 0.90–1.10, emerald 1.30–1.40, oval 1.30–1.70, pear 1.45–1.75, and marquise 1.75–2.30. Use these ratios to refine the look of a fancy-shaped Ideal Cut diamond.

2 Carat Diamonds

Fair Cut Diamonds

G Color Diamonds

Super Ideal Cut Diamonds

Loose Diamonds

Good Cut Diamonds

Marquise Cut Diamonds

Round Cut Diamonds

Pear Shaped Diamonds

Very Good Cut Diamonds