https://www.youtube.com/watch?v=2rVn3qB1_Vg

When it comes to diamond engagement ring we have all heard about the 4 C’s. There is another important factor when it comes to fancy shape diamonds that sometimes is forgotten which is the length to width ratio. The length to width ratio is the millimeter length of the diamond divided by the millimeter width of the diamond. While this may seem like just another detail, it will have a huge impact on the appearance of your diamond. As with many other quality factors in the diamond world there is not absolute right or wrong answer; just general guidelines to consider when making your decision based on personal preference.
Follow along by watching the video and read these excerpts from our most recent blog:
For the two cushion cut diamonds: the one on the left has a ratio of 1.07:1 resulting in a slightly elongated look. The one of the left has a ratio of 1.14:1 giving it a more visible rectangular appearance.
On the left we have a 1.17 ratio radiant cut which gives a fuller look. The one on the right is a 1.33 ratio giving a very rectangular and elongated appearance.
In our sample video the 1.53 carat emerald on the left has a 1.34 ratio giving a fuller appearance. , while the one on the right has a 1.4 ratio creating a more elongated appearance.
The 2.36 carat oval on the left has a ratio of 1.34. Notice how the oval on the right weighs 2.2 carats with a ratio of 1.4. Because the ratio is a big longer you can tell the length is longer while the width is more narrow.
The pear shape diamond on the left weighs 1.5 carats and the ratio is 1.47. The pear shape on the right weighs the same and the ratio there is 1.57
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There is no right or wrong diamond ratio it really comes down to the shape that appears most pleasing to your eye.