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what is a window,please?

pinkjewel

Ideal_Rock
Joined
Aug 1, 2011
Messages
2,210
I'm just learning about colored stones and different cuts and I've been reading a lot here- but would someone mind telling me what a "window" is? I keep seeing the term-but what exactly causes it?
 

ZestfullyBling

Brilliant_Rock
Premium
Joined
May 27, 2010
Messages
1,992
Hi PinkJewel :wavey:

I found this definition of "window" on the ACStones website:
"Window: A window is an area under the table of a stone that does not reflect light. It's called a window because light goes through it like window glass. It is almost always undesirable and occurs when pavilion facets are cut below the critical angle for a gem material. To test for a window, hold a gem, face up, with the table parallel to a sheet of newspaper and look through it. If you can read the print, the stone has a window. Most native cut stones have large windows as using low pavilion angles allows a larger stone from a given piece of rough."

http://www.acstones.com/info/Definitions.html

Hope this helps. :))
 

pinkjewel

Ideal_Rock
Joined
Aug 1, 2011
Messages
2,210
thank you so much- that does help, although looking at some pictures that people are talking about the stone having a window- I still can't see it :confused:

Maybe with time...
 

FrekeChild

Super_Ideal_Rock
Joined
Dec 14, 2007
Messages
19,456
This should help.

Blue stones- window on right.
Pink stones- window on left.

window-2-gem-blue.jpg

gem window from john dyer website 2 stones.jpg
 

pinkjewel

Ideal_Rock
Joined
Aug 1, 2011
Messages
2,210
Wow.. that really does show it so well. Thank you!!
 

LD

Ideal_Rock
Premium
Joined
Jun 29, 2008
Messages
9,699
Pink jewel - it's also important to note that a window is only one that you can see when you look at a gemstone head on. It's not when you look at a window and see a similar effect when the gem is viewed from the side - this is called a tilt window. The photos below show a tilt window and this is absolutely nothing to worry about.

Tourmaline tilt window.jpg
 

pinkjewel

Ideal_Rock
Joined
Aug 1, 2011
Messages
2,210
thank you LovingDiamonds- it is very helpful to see the pictures =)
 
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