Tolkowsky's Diamond Design suggests that a round brilliant cut diamond will be most brilliant when cut to a total depth of 59.3% with a table diameter of 53% and a crown angle of 34.5 degrees, with a pavilion angle of 40.75 degrees, and a zero percent girdle, which is essentially impossible to produce, because it would ...

Ideal cuts are truly the elite of the diamond world; an Ideal cut diamond reflects nearly all the light that enters it and emits the most sparkle. They represent the top 1% of diamonds in terms of both quality and sparkle. If you're looking for the best cut diamond to buy, the Ideal cut is it.

Tolkowsky round diamonds are guaranteed to score a minimum of three “very high” ratings for SI2 solitaires and two “very high” ratings for SI1 bridal and studs in the measurements of brilliance, fire and sparkle in a report by GemEx, an independent scientific laboratory that specializes in measuring diamonds' light ...

You can rest assured that Tolkowsky diamond rings are of exceptional quality, with a minimum colour classification of 'I', and a minimum clarity of 'I1', but if you are interested in mastering the 4 C's to help you narrow down your choice, see our Diamond Guide.

EGL Tolkowsky Range: 33 – 36° Crown Angle. 40 – 41.5° Pavilion Angle. 56 – 63.7% Total Depth. 53 – 57% Table Diameter.

Top Diamond Brands in the World

• Harry Winston. For almost eighty years, American jewellery designer Harry Winston has been one of the most trusted names in the diamond trade.
• Cartier.
• Tiffany & Co.
• De Beers.
• David Yurman.
• Chopard.
• Van Cleef & Arpels.
• Mikimoto.

For round brilliant diamonds the Ideal cut is considered the highest rating. Only 3% of diamonds are given the GIA Ideal rating. So called Super Ideal diamonds are cut to a higher standard than either GIA or AGS highest cut ratings.

Ideal is the next highest cut grade reserved for Round Brilliant cut diamonds. Ideal diamonds are cut to maximize brilliance with perfect proportions. This is a rare quality held by <1% of all diamonds. Excellent is the highest cut grade for all diamond shapes outside of Round Brilliants.

As an example of knowing what you're getting with diamond brands: All Tolkowsky round diamonds are guaranteed to score a minimum of two “very high” ratings in the measurements of brilliance, fire and sparkle in a report by GemEx, an independent scientific laboratory specializing in measuring light performance of ...

Hands down, moissanite is the number one alternative when it comes to the best fake diamonds for a number of reasons.

The nine major gemstones cut from the 3,106 carats rough Cullinan diamond, the largest gem-quality diamond ever found. Top: Cullinan II (317.4 cts), I (530.2 cts), and III (94.4 cts). Bottom: Cullinan VI (11.5 cts), VIII (6.8 cts), IV (63.6 cts), V (18.8 cts), VII (8.8 cts), and IX (4.39 cts).

De Beers Forevermark diamonds 'A Diamond Is Forever' represents our commitment to investing in the future and is a symbol of the powerful and binding promises made with De Beers Forevermark diamonds; the promises to your soulmate that are eternal and everlasting; the promises of devotion and care and the promises of your future together.

First discovered in India Early descriptions of diamond date back to the 4th century BC, by when diamonds were a valuable material already. The earliest known mention of a diamond was found in a Sanskrit manuscript by a minister in a northern Indian dynasty, dated from 320-296 BCE.

round brilliant cut diamond But all the different shapes and styles can also be overwhelming. There are so many different types of diamond cuts and each has its unique qualities and price points. By and large, the single most expensive diamond cut is the round brilliant cut diamond.

Diamond Cut Grade Chart

• Ideal+Hearts. This is the top cut grade and is only used for Round Brilliant cut diamonds.
• Ideal. Ideal is the next highest cut grade reserved for Round Brilliant cut diamonds.
• Excellent. Excellent is the highest cut grade for all diamond shapes outside of Round Brilliants.
• Very Good.
• Good.
• Fair.
• Poor.

Simply put, the GIA "Excellent" or AGS "Ideal" cut grades will suffice for most buyers. Judging a diamond's performance beyond that requires some expertise and a good eye. Take a look at the videos of these two James Allen diamonds: one excellent cut and one True Hearts™. Compare them side by side at James Allen.