A brilliant cut diamond of one carat weighs exactly the same as a mine cut of one carat.
If the diamond is a round brilliant cut, the measurement across the girdle is between 5.9 mm, which weighs approximately .75 carats, and 6.2 mm, which weighs approximately .85 carats. If the diamond is a different cut, there is not enough information in your question to answer it: other cuts require more than one measurement.
Grammatically, mine cut is proper. You can read more about how this cut got its name, below.
You may be thinking of a mine cut, a cut of diamond favoured in the early 1800s. You can read more about this cut and its place within the history of diamond cuts, below.
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.
From its Wikipedia entry: "The Tiffany Yellow Diamond is one of the largest yellow diamonds ever discovered; its carat weight is 287.42 carats (57.484 g) in the rough when discovered in 1878 in the Kimberley mine in South Africa, and was cut into a cushion shape of 128.54 carats (25.108 g) with 82 facets-24 more than a traditional round brilliant-to maximize its brilliance."
If the diamond is a round brilliant cut, the measurement across the girdle is between 5.9 mm, which weighs approximately .75 carats, and 6.2 mm, which weighs approximately .85 carats. If the diamond is a different cut, there is not enough information in your question to answer it: other cuts require more than one measurement.
The largest diamond mine in area is in Botswana, in Africa: The Orapa diamond mine. Read more about it, below.
A mine in Mirny, Siberia claims online to be the largest, deepest diamond mine, to a depth of more than 500 meters. You can read more about it, and view images, below.
According to the Diavik Diamond Mine Web site, below, the mine covers three kimberlite pipes -- diamond ore bodies -- that produce higher-than-average-quality stones. Read more about the mine in its fact book, below.
"Mine Diamonds" or "Old Mine" Diamonds refers to a specific shape of a cut and polished diamond popular many years ago. Diamonds that are mined from the earth are in a "rough" state, that is not yet cut and polished. The rough diamond is then cleaved, or sawed into two or more pieces, and then those pieces are shaped by further cutting, bruting, or polishing into a specific shape. The popular shapes of diamonds today include the Round Brilliant (the most popular) the Princess, the Emerald, the Radiant, the Pear, the Marquise, the Oval, the Heart, the Cushion, the Trillion shapes. The "Old Mine" shape was the early predecessor of the Round Brilliant, and resembled the modern Cushion shape. The Old Mine shape evolved into the "Old European" shape, which was more round.
CZ stands for Cubic Zirconia, which is a synthetic gemstone. The difference between a diamond and a CZ is that the diamond is a real gemstone. CZ weighs more than a real diamond and is more affordable.
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.
You can read more about the Spirit of de Grisogono black diamond, below, which weighs 312.24 carats.
more brilliant, most brilliant
If your abbreviation pt translates to points, then the diamond weighs 1.12 carats.There is no more information about the diamond given this description -- not its cut, colour, or clarity.
Grammatically, mine cut is proper. You can read more about how this cut got its name, below.
By faces, one must assume that you mean facets. The brilliant cut, according to Wikipedia: "The original round brilliant-cut was developed by Marcel Tolkowsky in 1919. The modern round brilliant consists of 58 facets..." You can read more, below.