And so we reach Trilliant (or Triangular Brilliant) Cut Diamonds. Providing that Trillian Cut stones are Cut correctly (particularly in relation to their depth), they exhibit fantastically sharp fire and brilliance - truly stunning.
And so we arrive at the most popular Diamond shape / Cut today, the Round Brilliant. Always a popular shape, and for good reason: The Round Brilliant Cut follows more closely the shape of the natural Diamond crystal and as such it is possible for skilled craftsman to produce an "Ideal" Cut, completely maximizing the fire and brilliance of any given stone and releasing the scintillation from within.
The great thing about Radiant Cut Diamonds is the fact that they look equally great paired with either Round shaped sidestones or Baguette shaped sidestones. 
Princess Cut Diamonds are traditionally square in shape, but some people actively seek out rectangular Princess Cuts as by its very nature a Princess Cut Diamond varies a great deal with regards to how square or rectangular any particular stone is. 
Pear Cut Diamonds essentially look like teardrops - they have a rounded edge and one single point. The Pear Cut is not too different from the standard Round Brilliant Cut and as such is one of the fancy Diamond shapes that is relatively popular - this is because whilst it is a "fancy" Cut it is not too unusual and does not stray to far from what is perceived as the "norm."
Oval Cut Diamonds are not dissimilar to Round Brilliant Cut Diamonds and the brilliance they often display is very nearly equal to that of a Round Brilliant Cut. The other major positive with an Oval Cut stone is that the shape can be used to effectively accentuate longer, slender fingers.
As with all Diamonds one factor of major importance is what you, the customer wants or expects from their Diamond. What is right for one (or even the masses) may not be right for you as an individual.
Any Diamond Broker / Dealer / Retailer / eTailer worthy of your attention should offer you a reasonable time-scale with which you have the Diamond to decide whether you like it & to have it checked out independently by someone else as well if you so wish. (The usually accepted time period tends to fall anywhere between 15 and 30 days, giving you plenty of time to decide whether or not you have found the right Diamond for you).
Having said all of the above, here comes the usual length to width ratios:
Acceptable is anywhere from 1.5-1.75:1, whereas the most desirable is said to be 1.5:1.
The main advantage of a Heart Shaped Diamond is that it has a pavilion that is nearly round. This results in real beautiful brilliance. When choosing a Heart Shaped diamond do bear in mind and pay special attention to the Color you select - any grade above an I Color may well equal visible Color in the corners of your otherwise beautiful stone.
The main factor differentiating an Emerald Cut Diamond from other Cut styles is the pavilion which is generally cut with rectangular facets, designed to create a unique brilliance.
Believe it or not, one of the main the reasons that Cushion Cut Diamonds have larger than average facets and rounded corners is to maximize their brilliance under candlelight!
Yes it's true. This may be unbelieveable to some but there are Diamond shapes named after those famous French breadsticks, or "Baguettes"!
There are two main types of Baguette Cut / Shaped Diamonds - The regular Baguette Cut (sometimes referred to as the Pronounced Baguette), and the Tapered Baguette.
It is very unusual to come across large sized Baguettes; This shape is usually used to accompany and complement other larger Diamonds and Baguettes predominantly play the role of the smaller stones in any given setting.
Baguettes, be it "Pronounced", or "Tapered" have acceptable length to width ratios of 1.5-2.5:1, with the optimum proportions generally considered to be 1.5:1.
Asscher shaped Diamonds are not unlike Emerald Cut Diamonds, with the main difference being the fact that Asscher shaped Diamonds are square.
There are two very important considerations to be made when selecting an Asscher shaped Diamond - Color and Clarity.
When selecting the Color for your Asscher shaped Diamond, consider carefully the fact that Color may be slightly visible in the corners if you were to choose an I Color or less.
Also remember that the shape of an Asscher Diamond highlights the Clarity of the stone so be sure to find out exactly where any inclusions are present.
Lastly you need to pay attention to the dimensions of the stone:
The preferred length-to-width ratio is 1:1. However, the acceptable length-to-width ratios fall between 1-1.4:1.
Below you will find a glossary / explanation of words often used when describing different parts of a Diamonds anatomy:
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