Simulant Alexandrite - Soft?

Or sometimes you just gotta laugh.

Last time I checked simulant alexandrite is normally corundum yes?
Nice tough stone corundum.

A little less then a year ago I made my first diamond ring, also in
that ring was a topaz and an alexandrite simulating corundum…
guess which one the customer chipped? Yup that’s right, the one
without cleavage planes and a hardness of 9. So is there something
about these stones that I don’t know or am I allowed to just laugh at
the chances now?

Cheers,
Norah Kerr
www.besmithian.com