There is no 'best' cut for diamond stones, since each stone's cut reflects the other valuable aspects of the stone.
When a diamond is cut, its innate properties are always considered. Generally, a diamond is cut to minimize the number of visible flaws while maintaining its highest carat weight. Colour may be the largest variable, since colour can be enhanced using radiation. (Some flaws can be minimized using laser technology.)
The 'best' diamond is one you can afford that is accompanied by a certified gemologist's report that details its colour, clarity, carat weight and cut. Whenever a diamond has been 'treated', that is also noted on the certificate, and will reduce the value of the diamond.
Wikipedia lists its cut as "Antique cushion."
From Diamond Source: "A cushion cut is a square or squarish-rectangular cut with rounded corners and 58 brilliant-style facets that resemble a pillow shape..." You can read more about this cut, below.
Diamond cut on its own makes little difference in terms of long-term value of any diamond. Different cuts, however, can have a 'fashion bump' so that there will be periods when one cut or the other may earn a higher re-sale price than another cut. Generally, a diamond's cut highlights the stone's major attribute(s), which may be clarity or colour or carat weight. The most critical thing you can do to verify you maximize your Cushion Cut precious stone is to know precisely what you have. You can pay for a certified gemologist to document the diamond's characteristics. Likewise with other extravagant shapes, Cushion cuts can't be characterized by numbers, yet there are some fundamental rules to consider. This cut may not be as complex as heart cut stones and other curiosity shapes. Similarly, as with any jewel, the qualities (carat, colour and clarity) will focus the stable market value significantly more than the shape of the cut.
There are as many cuts of diamonds nearly as there are diamonds. Predictable cuts include, round brilliant, emerald cut, cushion cut, pear shape, oval and so forth. Some jewelers also sell heart-shape cuts, square cuts and more. Sometimes, larger stones are cut in a unique way, so as to best display the diamond's best assets, whether they be colour, clarity or carat weight.
The round diamond shape is the most popular shape and accounts for about 75% of all diamonds that are sold. The reason being that, due to the way it is cut, it maximizes brightness. The princess cut diamond has a square or rectangular shape and it’s the second most popular diamond shape after the round diamond. The reason why the princess cut is cheaper and more affordable than a round cut is due to the fact that the yield from the rough stone is 80-90%, whereas the round diamond yield is about 40%. The larger the yield is the more affordable the diamond is.
Wikipedia lists its cut as "Antique cushion."
A "cushion" diamond refers to the shape of the diamond, which in this case looks a bit like a cushion. It is an older cut that is making it's way back into stores today. It is square with rounded corners and somewhat like the "Old Mine Cut".
From Diamond Source: "A cushion cut is a square or squarish-rectangular cut with rounded corners and 58 brilliant-style facets that resemble a pillow shape..." You can read more about this cut, below.
It is not known the particular year that the cushion cut diamond debuted, but the style of diamond has been around for hundreds of years. It continues to be a popular style of diamond.
There are as many cuts of diamonds nearly as there are diamonds. Predictable cuts include, round brilliant, emerald cut, cushion cut, pear shape, oval and so forth. Some jewelers also sell heart-shape cuts, square cuts and more. Sometimes, larger stones are cut in a unique way, so as to best display the diamond's best assets, whether they be colour, clarity or carat weight.
No, a diamond is not normally cut into a square shape.
Since cushion cut is a rather square cut, one must assume that your diamond measures 7mm x 7mm. In this case, it weighs approximately two carats.
You can find information about cushion cut diamond engagement rings from the Wikipedia website. Once on the page, type "Diamond Cut" into the search field at the top right-hand side of the page and press enter to bring up the information.
The princess cut diamond has a square or rectangular shape and it’s the second most popular diamond shape after the round diamond. The princess cut is cheaper and more affordable than a round cut is due to the fact that the yield from the rough stone is 80-90%, whereas the round diamond yield is about 40%. The larger the yield is the more affordable the diamond is.
I think what you are referring to is known as the "Baguette Cut". Some other cuts are:Solitaire Cut- a cut rounded at the top, which is sometimes, as the name implies, a solitaire stone, but is sometimes surrounded by other diamonds of the same, or different cutsPrincess Cut - a square cutMarquis Cut - a diamond shaped stone, much like the diamond shape in the diamond suit of a deck of cardsRound Cut - round, as the name implies, and usually clustered together with other diamonds of the same cut.Additionally, you may be thinking of an emerald cut which is a rectangular shape. There is also the cushion cut, which is a cross between an oval and an emerald cut.
Diamond cut only refers to the shape of the links in the chain.
A radiant cut diamond is a diamond cut invented in 1977 by Henry Grossbard that infuses the rectangualar or square shape of an emerald cut diamond with the brilliance of a round diamond.