The name for a large flawless diamond of 99 carats or more is a Paragon.
In olden days, this name was given to flawless diamonds that were at least 12 carats, however the standard was raised over time.
The value of 1.45 carats of diamonds will depend on weather you have one single diamond or more. Do you have 145 diamonds with a total weight of 1.45 carats or 2 0.5 carat diamonds and a 0.45 carat diamond? Large diamonds are many many times more valuable than small ones and a single 1.45 carat diamond will be worth far more than tree diamonds with a total carat weight of 1.45 carats
A stone of this quality is known as a Paragon -- and there is such as stone: named The Paragon.You can read more about it, below. From that page:"The largest flawless diamond in the world is known as The Paragon - a D-class gem weighing 137.82 carats (27.56 g), which is the 10th largest white diamond in the world." Today it is apparently in the possession of Graff Jewelers.
(When you indicate 'white' one must assume the D colour. There may be larger stones in the world, but this is the largest graded with a D colour.) Apparently, it is the DeBeers Centenary Diamond, described as weighing in at 273.85 carats (54.77 g). It is a D colour stone, and is internally and externally flawless. Read more, below.
it is important because it is the largest uncut diamond ever discovered.
About 3.5$ mil.added 11/3/2010Not exactly true.A standard ounce of is 141.747 carats.Industrial diamonds can sell for $1-$5 per carat .Jewelry grade diamonds can cost $50 per carat for the smallest diamonds to $2000-$10,000 for a nice white 1 carat diamond to $25 million for a 50 carat diamond. ( diamond over 20 carats are generally considered semi unique and hard to price)So given that range an ounce of diamonds can cost from about $150 up to $300,000,000. In addition since a single 141.47 carat diamond would be one of the largest diamonds in the world, it could be priceless
A Flawless diamond is called Flawless on the clarity scale. The diamond is also graded according to its colour, its carat weight and its cut. Unless the stone is larger than about 10 carats, it might not have a name. However, if it is a strikingly unusual colour, a smaller stone might be named. You can read more about named diamonds, below.
The largest Flawless, D Colour diamond for sale today on Blue Nile weighs 7.65 carats and sells for US$1,167,550 or US$152,621 per carat. (You can calculate your 10-carat estimate from this per carat value.) You may be able to find a different 'perfect' and differently coloured diamond at an auction house that weighs exactly 10 carats. The diamond could be a Deep Fancy yellow, blue, pink, or other colour. There, the price will be established by the bidders in the room at the time of sale. A deep fancy coloured diamond that is flawless and large will probably cost you more per carat than the D colour diamond, above.
paragon
You can read more about the Spirit of de Grisogono black diamond, below, which weighs 312.24 carats.
Usually individual stones of more than 100 carats are named by the original buyer of the rough stone from which the finished carat weight is more than 100 carats. Generally, they are known as "...large or extraordinary diamonds," according to Wikipedia. Read more, below.
According to the site, below, the largest cut diamond is The Golden Jubilee which weighs 545.67 carats. The largest raw natural diamond is the Cullinan, weighing in at more than 3,000 carats.
The value of 1.45 carats of diamonds will depend on weather you have one single diamond or more. Do you have 145 diamonds with a total weight of 1.45 carats or 2 0.5 carat diamonds and a 0.45 carat diamond? Large diamonds are many many times more valuable than small ones and a single 1.45 carat diamond will be worth far more than tree diamonds with a total carat weight of 1.45 carats
Large diamonds, typically more weighty than 14-20 carats, and many larger, earn their names based on who owns them, or who has owned them. Buying a 'large' diamond also buys diamond naming rights.
When you own a diamond of this carat weight, you can name it whatever you like.
Uncut, the largest raw diamond ever found was over 3,000 carats. You can read more about large cut stones and their carat weights on the link, below.
The heaviest diamond has the most carats. The heaviest diamond found to date was found in 1906 in South Africa, and it weighed more than 3,100 carats. Physically, it filled the palm of a grown man's hand.
A stone of this quality is known as a Paragon -- and there is such as stone: named The Paragon.You can read more about it, below. From that page:"The largest flawless diamond in the world is known as The Paragon - a D-class gem weighing 137.82 carats (27.56 g), which is the 10th largest white diamond in the world." Today it is apparently in the possession of Graff Jewelers.