coatimundi_org
Ideal_Rock
- Joined
- Dec 9, 2007
- Messages
- 6,281
Good work Coati,Date: 2/13/2009 3:33:13 PM
Author: coatimundi
LGK--thanks much!
I was looking at a chapter in one of my textbooks, and it''s vague, but corresponds to what you have observed.
It states that the first automated polishing machines appeared in the 1970s. In the early 90s--machines were developed to polish stones with crystal structure irregularities. It goes on to state that machines were developed to facet girdles, but no specific dates. So somewhere in the 80s-90s?
I prefer the look of frosted girdles to faceted.
Thanks Al, very interesting.Date: 2/13/2009 11:34:14 PM
Author: Al Gilbertson
Ernest Schenck applied for a patent for faceting the girdle on a diamond to protect it from chipping (knife edged girdles were the norm then) in 1904. The patent was granted in 1906. Patent # 809531. While the patent mainly talks about a single curved polished facet, the claims also discuss more than one part to this single curved facet at times—allowing for the faceted girdle. Schenck preferred a single facet (i.e. a smooth polished girdle), but with this, he and those who used his patent also did multiple facets around the girdle. The main point was to protect the diamond from chipping. He essentially advocated thickening the girdle beyond the knife edge that was common then.
So very true..., thank you AlDate: 2/13/2009 11:34:14 PM
Author: Al Gilbertson
Ernest Schenck applied for a patent for faceting the girdle on a diamond to protect it from chipping (knife edged girdles were the norm then) in 1904. The patent was granted in 1906. Patent # 809531. While the patent mainly talks about a single curved polished facet, the claims also discuss more than one part to this single curved facet at times—allowing for the faceted girdle. Schenck preferred a single facet (i.e. a smooth polished girdle), but with this, he and those who used his patent also did multiple facets around the girdle. The main point was to protect the diamond from chipping. He essentially advocated thickening the girdle beyond the knife edge that was common then.
Date: 2/14/2009 4:33:19 AM
Author: Garry H (Cut Nut)
Thanks Al, very interesting.Date: 2/13/2009 11:34:14 PM
Author: Al Gilbertson
Ernest Schenck applied for a patent for faceting the girdle on a diamond to protect it from chipping (knife edged girdles were the norm then) in 1904. The patent was granted in 1906. Patent # 809531. While the patent mainly talks about a single curved polished facet, the claims also discuss more than one part to this single curved facet at times—allowing for the faceted girdle. Schenck preferred a single facet (i.e. a smooth polished girdle), but with this, he and those who used his patent also did multiple facets around the girdle. The main point was to protect the diamond from chipping. He essentially advocated thickening the girdle beyond the knife edge that was common then.
Here is a link to the patent:
http://www.google.com/patents?id=SBZwAAAAEBAJ&printsec=abstract&zoom=4&dq=809531#PPA2,M1
Date: 2/13/2009 8:25:12 PM
Author: cofor
Coati, I have not faceted a stone since 1998 and not cut a diamond since 1996. That was when I had to realize that cutting and repairing diamonds in a ''gemstone illiterate'' country like sweden was to hard a way to support a family. I sold much of my stock at the Tucson show in 96 and shut my business down the following fall. Since then I have been busy in the IT-world and as our kids now are grown up and have left home my wife and I have more time (and cash) left. Plans are now emerging to get started with faceting colored stones again. I have quite a stock of rough which has ben stuffed away in bags since the late 90''s. Right now I''m going through the collections and picking out nice pieces of different materials that are suitable objects. It was not as common to make images of stones you cut in those days as it is now. I do have a image somewhere of the biggest round brilliant I ever cut. We took a pic right after it was finished and just wiped clean. Will try to find it.