Find your diamond
Find your jewelry
shape
carat
color
clarity

Light Questions

Status
Not open for further replies. Please create a new topic or request for this thread to be opened.
Cehrabehra

Cehrabehra

Super_Ideal_Rock
Joined
Jun 29, 2006
Messages
11,071
What is the angle of dispersion for colored light (red through violet) off of various facets in a diamond?

What is the angle of light reflection off of the surface?

Anyone got a link? I don''t mean the basic this is light through a diamond, I mean numbers.
 
angle of dispersion?


0.044
 
angle of incidence=angle of reflection

you knew that.
2.gif
 
Date: 7/20/2006 4:02:22 AM
Author: JulieN
angle of incidence=angle of reflection

you knew that.
2.gif
Click to expand...
bahahaha! do I? LOL! I knew it for glass... but I wasn''t *positive* that it was for diamonds. I know some very basics about physics and geometry, but I don''t know squat about optics LOL I''m such a freaking geek... you should see the geometric drawings I have in front of me right now. I learn through doing LOL And since there is no ''ideal'' for the stone I want, I guess I have to do the research, don''t I? LOL!!
 
Date: 7/20/2006 3:54:28 AM
Author: JulieN
angle of dispersion?


0.044
Click to expand...
Okay, showing my ignorance here... but is that for a particular wavelength or is that the angle range from red to violet or is that the angle of difference from incidence? Perhaps I should also ask the angle of refraction. LOL (that's probably what I meant in the first place, but really I want all of these answers! lol
 
for red to violet. there's no such thing as angle of dispersion.

I think you need Diam Calc to figure out angle of refraction. The refractive index is 2.417.

angle of incidence=angle of reflection for all materials.
 
Date: 7/20/2006 4:18:41 AM
Author: JulieN
for red to violet. there''s no such thing as angle of dispersion.

I think you need Diam Calc to figure out angle of refraction. The refractive index is 2.417.

angle of incidence=angle of reflection for all materials.
Click to expand...
ahhh thank you! I was just reading your who''s who and thought, now how great is that? My background was astronomy... but being theoretical, I didn''t enjoy much looking at stars or using telescopes... spectrums interested me to an extent, but I never dealt with reflection and really only know a little about spectral analysis and not so much about refraction in relation to light passing through a material on earth LOL This is all totally new and frankly it''s been *years* (16) since I''ve been in school LOL I''m really looking forward to the kids being off to school so *I* can go back to school... and have to wait for dh to finish his masters. I figure in 3 years I''ll be back full time and for about 10 years thereafter. I just HAD to be a mommy first. My best friend already has her Ph.D. but no hub or kids... the different struggles we have are so contrasting. Anyway, I digress...

Is there a diagram that you know of that shows the angles (numbers) that light enters the diamond and reflects and refracts within the facets? I''ve been trying to figure it all out using math and I''m afraid I''ve burned too many of my atrophied braincells tonight already LOL I really want to be figure out how an OMC would be ideal- or at least my ideal which would be the reflection of 8 clear culet "spots" symmetrically framed in the bezel facets. My brain is cramping LOL
 
Cehra, to do that, you would definitely need Diam Calc.
 
Date: 7/20/2006 4:18:41 AM
Author: JulieN
for red to violet. there''s no such thing as angle of dispersion.
I thought it was 0.044? hehe ;)

I think you need Diam Calc to figure out angle of refraction. The refractive index is 2.417.
Well, ya don''t NEED one, you could crunch it all yourself... okay... ::going to cram on the refractive index:: ::thinks to self::~> and someone had to program the Diam Calc to *work* yikes... more brain cramps! lol

angle of incidence=angle of reflection for all materials.
Good to know! LOL (seems so simiple huh? @@ at self)
Click to expand...
 
Quick threadjack....I am interested in astronomy in a hobbyist way, I enjoy freezing on a frosty night with my telescope!
37.gif
 
Date: 7/20/2006 5:07:35 AM
Author: Lorelei
Quick threadjack....I am interested in astronomy in a hobbyist way, I enjoy freezing on a frosty night with my telescope!
37.gif
Click to expand...
:D My best friend got us a telescope for a wedding gift... and I hated using it LOL I mean, I''d look at the moon moving through the sky and it would *scare* me LOL I spend a lot of time attempting to grasp the physics of the universe and the particles that create it, but when I think of space and look at the stars, I think of the galaxy that''s on a collision course with the milky way and the end of life for our sun... and I start getting way too freaky about the blink of reality we''re in LOL Much better for me to focus on the extremes where I can see it all as one big picture LOL I try to enjoy the sky... I do... but that''s pretty much why I decided astrophysics was likely not the best course for me LMAO! I enjoy the chemical composition of stars, but thinking of their massive bulks suspended in space careening with one another...

... and I think that is part of why I like diamonds... that pure carbon experience LOL nahhhhhhh I want to be cinderella at the ball with some bling :D
 
$320 at Garry''s site. I think you''ll be much happier with this if you still want to try to make your own cut.
 
Date: 7/20/2006 6:37:48 AM
Author: JulieN
$320 at Garry''s site. I think you''ll be much happier with this if you still want to try to make your own cut.
Click to expand...
oh owie. My husband probably already thinks I''ve lost my mind... I think I''ll stick with crunching numbers and if I go down that road I''ll hire someone to do it LOL ::back to geometry:: I''ll get my husband to crunch the light numbers LOL
 
I know it can blow your mind if you think about it too much, that''s why I concentrate on spotting constellations with the naked eye just as much as I do the telescope and try just to think of them as celestial pretty objects rather than something whose power and magnitude our minds just CANNOT grasp, well, mine anyway! Also handy for directions when driving at night!
 
Date: 7/20/2006 7:24:49 AM
Author: Lorelei
I know it can blow your mind if you think about it too much, that''s why I concentrate on spotting constellations with the naked eye just as much as I do the telescope and try just to think of them as celestial pretty objects rather than something whose power and magnitude our minds just CANNOT grasp, well, mine anyway! Also handy for directions when driving at night!
Click to expand...
I like looking (esp the milky way) until I start thinking, then I have to look away LOL


Okay... so I have another question here... it''s light-related, so I figured I''d save us all from another new thread and post it here...


Is most "fire" in a diamond displayed through the crown facets or the table?
 
There is, in fact, a unique angle of dispersion for each wavelength of light throughout the spectrum. Dispersion, at its extremes, is the difference in the refractive index of a gem material at the B and G Fraunhofer wavelengths of 686.7 nm and 430.8 nm and is meant to express the degree to which a prism cut from a gemstone shows "fire", or color. So coming from the field of astronomy, as you are, this is not an unreasonable question, but one which gemologists are not used to dealing with.

I'm sure, as you suggest, it will be quite easy to crunch the #'s for any given wavelength, but it may not have any practical significance in looking for a well performing diamond!
emwink.gif


Good luck!

PS: Crown facets is the answer to your last question.
 
Date: 7/22/2006 2:31:16 AM
Author: DiamondExpert
There is, in fact, a unique angle of dispersion for each wavelength of light throughout the spectrum. Dispersion, at its extremes, is the difference in the refractive index of a gem material at the B and G Fraunhofer wavelengths of 686.7 nm and 430.8 nm and is meant to express the degree to which a prism cut from a gemstone shows ''fire'', or color. So coming from the field of astronomy, as you are, this is not an unreasonable question, but one which gemologists are not used to dealing with.

I''m sure, as you suggest, it will be quite easy to crunch the #''s for any given wavelength, but it may not have any practical significance in looking for a well performing diamond!
emwink.gif


Good luck!

PS: Crown facets is the answer to your last question.
Click to expand...
Thank you :) Yes, the time I spent with the spectrum doesn''t translate well to diamonds! I dunno if "quite easy" is a term I''d use, but it can be done! LOL But you''re right, It is probably irrelevant LOL I do appreciate your response though - it''s been fun tapping into the underused part of my brain to consider these things!
 
Status
Not open for further replies. Please create a new topic or request for this thread to be opened.
GET 3 FREE HCA RESULTS JOIN THE FORUM. ASK FOR HELP
Jewelry Blog
PriceScope-Concierge-Ad
Find prime cuts.
Top