AndrewD[HoMe Moderator]
12829
I am going to have to check ...
... my copy of Daniels Watchmaking to see if that's the traditional method, Tom!
Is that what they teach in watch making 101?!

A
Black "rubies"...
By: Emil Wojcik : October 25th, 2011-07:49
...would more accurately be described as black sapphires. Rubies and sapphires are chemically the same mineral (corundum), with different impurities giving them color (red corundum is ruby, all other colors are sapphire). Black sapphires are actually very...
Black ruby making....
By: DonCorson : October 25th, 2011-11:40
A short telephone call to Mr. Benzinger and the mystery is over. The rubies stay in place when the bridges and plates are coated with black PVD. Then the black PVD coating is removed from the active surfaces of the jewels by honing. Actually pretty simple...