Again because of the random orientation of diamond particles. Natural diamond is a single crystal in nature and has soft and hard grains. Depending on the shape of the natural diamonds and the tool being manufactured, it is sometimes not practical to have the hardest grain on the cutting edge. Availability PCD is readily available in a large variety of shapes and sizes. Discs as large as 60 mm in diameter are now available.
Natural diamond is limited to what is formed in nature.
Diamond, even with only an 8 mm long cutting edge is extremely difficult to find and is very costly. Flexibility PCD is a conductor. This allows us to routinely produce complex form tools and grooving tools with our wire EDM machines. Such tools are impossible to produce in natural diamond. Cost PCD blank costs are considerably lower than the cost of natural diamond stones, and the availability of different shape PCD blanks reduce manufacturing cost significantly.