I expect the Tensile Strength has a range due to various depths of flaws on the surface. A flaw could be a scratch on the surface or an imperfection in the single crystal structure. A surface with a shallow flaw has higher strength than a surface with a deep flaw.

Another way to decide if a given load is at risk of fracture is to assume a particular flaw depth on the surface and use that to calculate a Fracture Mechanics solution. Read the chapters on that in Help.

You need to compare the Stress Intensity Factor K(1) calculated from the flaw size and the nominal stress with the Fracture Toughness K(1c), a material property.

Here is a paper on the Fracture Toughness of Diamond.

I don’t know what Strength, Fracture = 1000 MPa means in the table of properties.