Irregular shapes are a specialty among some dealers due to their discounted prices. The buyer must not only know what the color and clarity outcome is likely to be, but also the shape and proportions of the finished product. If the rough piece is too irregular, additional weight loss will have to be taken into account for a finished stone that is salable and profitable.
The buyer that does well with this type of rough is exceptionally creative and can see potential value that perhaps the seller cannot. In addition, the buyer may have developed a market that very few other dealers could make a living in.