You can review the images, below, that are the result of the Google search for 'marquis cut diamonds'.
Your answer depends on its cut, clarity, colour, and whether or not the weight of the stone you describe is a gemstone or an industrial diamond.
The diamond if it is cut as a round brilliant gem, will measure 17.6MM at the girdle, which is almost three-quarters of an inch in diameter. If it is a different cut, its measurement will be different.
When you are selecting a diamond, there are a few things that you need to look at. The carat, the clarity, and the cut.
You can review the site, below, to see a replica of the raw stone and the named stones cut from it.
Two carats is the weight of the gem in question. Its looks depend on its cut, clarity, and colour.
You may be able to buy diamond chips or diamond dust -- which is sand-like -- from a diamond cutting operation. Diamond 'flakes' would be cut diamonds into a flake pattern, and you could commission such a cut from a diamond cutter.
No. Only another diamond can cut a diamond.
No. Only diamond can cut diamond.
A diamond aura is a (man made) synthetic diamond. It reproduces the look of a natural mined diamond. It involves the use of natural occurring minerals heated to a high heat of about 5000 degrees F. It's like a diamond in color, clarity, cut, and carat weight.
The biggest diamond in the world is the Golden Jubilee Diamond, which weighs 545.67 carats and has a yellow-brown color. It is cut into a cushion-shaped brilliant cut and is one of the largest cut diamonds in the world. It is estimated to be worth over $12 million.
Princess cut. They can retain 80% of the raw diamond and make less cuts while retaining only 50% of the raw diamond in a round or brilliant cut diamond and making more cuts to give the brilliant appearance.