Take the stone to a reputable gemologist and ask for a description of its cut, colour, carat weight and clarity.
Then ask a jeweler how much s/he would charge you for a comparable stone. This may give you an indication of about how much the stone is worth.
As introduction, from Wikipedia:"Pyrrhotite is an unusual iron sulfide mineral with a variable iron content: Fe(1-x)S (x = 0 to 0.2). The FeS endmember is known as troilite."Troilite is most common in meteors that originate on the moon or on Mars, and it is found in trace amounts on earth. Some meteorites have been found that contain diamond material. Most common of these is known as black diamond, or carbonado. But carbonado does not classically contain any troilite.In sum, a one-carat diamond with any trace of troilte would be hard to find within any gemstone marketplace, but you may have luck when trying to purchase a meteorite.
Carat for carat, no gem is more expensive than a diamond, given a superior cut, clarity and colour classification. Other gems can be more expensive than diamonds when the diamonds lack top qualities.
The 3,106 carat stone you reference is the rough diamond stone found in Africa, from which The Cullinan Diamonds were 'chipped'. That many carats weights about one and a third pounds.You can see in the photo, link below, of the largest of these 'chips' what a 503+ carat, cut and polished stone looks like in the hands of the jeweler.This means that the 3,000 plus carat stone -- the uncut, rough stone, was about six times the size of the stone in the top photo.An archive photo of the raw stone is visible further down the page. The stone appears to fill a man's hand.Some rough diamonds are shaped like two pyramids, joined at the base. This stone, however, appears to be shaped asymmetrically.
The Blue Hope Diamond.
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The largest carat diamond that was ever found was found by a man named Fredrick Wells in 1905. The diamond itself was found in Pretoria, South Africa.
The largest carat diamond ever found was the Golden Jubilee Diamond. It was found in 1908 and when it was cut weighed 545 carats. It is known as the Great Star of Africa.
The number inside a diamond ring refers to the carat weight of the diamonds found in the ring. A .50 stamped inside a Diamond Solitaire ring means that it has a 1/2 Carat diamond while a .97 means that it is just below 100 points or One Full Carat.
The biggest carat in a cut diamond is 20 carats. The largest diamond ever found was 530 carats.
The first diamond discovered in South Africa was found at Hopetown. It was the 23,25 carat Eureka.
Yes. An example of a 20-carat diamond ring can be found on Kim Kardashian's wedding ring.
From the DiamondWorld magazine: "State-run mineral giant NMDC recently discovered a 37.68 carat diamond from Panna diamond mines in Madhya Pradesh, which stands as its biggest discovery till date." You can read more, below.
The largest M color diamond that is easily found in an Internet search is an 8.74 carat diamond priced at US$146,122, as below. A larger stone will cost you relatively more.
As raw stones, a diamond can be as small as a grain of sand. As a cut stone, 1/100th of a carat, or .01 carat, also called one point is the smallest descriptive value found in a brief search.
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In South Africa, in a town called Cullinan, in 1906. The stone remains today as the heaviest -- by carat weight, in excess of 3,000 carats -- raw diamond found.
The world's largest gem-quality diamond found to date is the 3,106 carat Cullinan Diamond. It was discovered in Pretoria, South Africa, by superintendent Frederick Wells on 26 January 1905.