Dear Mary,
I would call Stuller and see if they can accommodate you. I have
called before with specific millimeter sizes between what they list
in the book, and more times than not they have been able to help me.
If color is really critical, you can send the chipped stone to them
for matching.
And take heart. We have all been in your shoes.
Best,
Brenda
david lee jeweler
Mason City, Iowa