I always wondered this too sir, but no one ever seems to show
or reveal the process right?! 😉 It’s like the secret of all Watch
secrets or something. 😄 With seemingly no one showing the
process, or even having a video of how they do it. Although as
you have probable seen, they say that the green tint comes from
iron oxide within the glass during melting. But I can’t help you
with what the exact process is. 🙁

Maybe a few of our real Rolex experts will be able to lend a hand
with this.

In any case, I really want to thank you for coming up with such a
great topic as this !!! ..I seriously don’t think I have seen it talked
about here.

Oh, and for fun, I just found a couple links for you:

Spotlight: Rolex Milgauss Green Sapphire Crystal - Watch Affinity

Watch Affinity takes a potted look at the history behind the Rolex Milgauss, and specifically at the Milgauss green sapphire crystal.

www.watchaffinity.co.uk

Green Sapphire Crystal On the Rolex Milgauss - The Luxury Hut

 

^^^ two great reads !! Enjoyable and informative.

 

I am so happy you liked them sir. 😀

 

If anyone is old enough to remember the green sapphire crystal on the Milgauss reminds me of the old Coke bottles from many years ago

 

I’m old enough sir. They were so nice Bob, and I was so upset
when they just switched to the clear class as well as plastic bottles,
and tin cans. 🥫..They just never seemed as cool, or rather as special
right?!

There was a real quality to the glass, which must be the same exact
case with the way the Milgauss crystal is. 🙂

 

"If anyone is old enough to remember the green sapphire crystal on the Milgauss reminds me of the old Coke bottles from many years ago"

Yes I remember them; I used to periodically reload my fathers circular Coke machine.
The bottles were something like 7 oz. and sold for a dime. Sold for a nickle to employees.

They did that in a funny way. The machine only accepted dimes so employees would pay the book-keeper a nickle and she would hand over a red painted dime.

And they were recycled.

I like the sapphire but (this Cheap Charlie) wouldn't pay a tremendous amount for it.