Tensile Strength of Diamond

[CCMac27]

I'm trying to teach myself how to do slicing/cutting calcs, and I'm starting with one where someone cuts a diamond. I Googled the tensile strength of diamond, and this is all I got:

The precise tensile strength of diamond is unknown, however strength up to 60 GPa has been observed, and theoretically it could be as high as 90–225 GPa depending on the sample volume/size, the perfection of diamond lattice and on its orientation

What value should I use? Or would it be best to use 60 as the low-end, 90 as the mid-end, and 225 as the high-end?
Let me know what you think. Would appreciate input on this.

 

[Thelastmlg]

Well they said on theory so maybe do the ends.