Diamond Guide, Information and Buying Tips for Loose Diamonds and Engagement Rings

Go Back   Diamond Forums @ Diamond Info.org > Diamond Forums > Diamond Discussions

Reply
 
Thread Tools Display Modes
Old 05-03-2008, 06:13 AM   #1
Twister 99
Diamond Rookie
 
Join Date: May 2008
Posts: 2
Rep Power: 0 Twister 99 is on a distinguished road
Default Bleached Diamond

How does the colour of a diamond change during the bleaching process? Is not the colour dispersed throughout the diamond?

Might anyone care to detail the process?
Twister 99 is offline   Reply With Quote
Old 05-04-2008, 09:22 PM   #2
Yosef
Verified Diamond Dealer
 
Yosef's Avatar
 
Join Date: Sep 2001
Posts: 139
Rep Power: 13 Yosef is on a distinguished road
Default

I'll try to answer your question....

Bleaching is from what I understand a treatment that is permanent but does not permeate the entire diamond with uniformity. And even if it did, it will certainly be detectable.

I don't really know too much of the process so I'm sorry I can't be more specific.
__________________
Yosef Adde

Adylon Diamonds & Bridal Jewelry
358 N. First St. Burbank, CA 91502.
Yosef is offline   Reply With Quote
Old 05-06-2008, 04:33 AM   #3
Twister 99
Diamond Rookie
 
Join Date: May 2008
Posts: 2
Rep Power: 0 Twister 99 is on a distinguished road
Default

I'm curious to know more about the process. I had not heard of it until I read it on the "Diamond Enhancements" section of the left hand navigation bar.

"Bleaching: The use of chemicals or other agents to lighten or remove a gemstone's color to achieve a brighter/whiter diamond."

I'd like to see what one of these diamonds looks like. If it is just a bleaching done on the surface, it would be interesting to observe the properties of the stone otherwise. Surely a bleaching would not interfere with the diamond's reflective properties.

Perhaps that begs of another question then: Does the colour of a diamond change the way in which light travels through the stone?
Twister 99 is offline   Reply With Quote
Old 05-06-2008, 11:40 AM   #4
Yosef
Verified Diamond Dealer
 
Yosef's Avatar
 
Join Date: Sep 2001
Posts: 139
Rep Power: 13 Yosef is on a distinguished road
Default

I've seen fracture filled, irradiated, HPHT, but never bleached diamonds so I'm really unsure to be honest.

There's no reason to buy any treated diamonds any how.

#1 The treatments are easily detectable.
#2 The resale value is next to none.
#3 With the money you'd still spend you could get something much better.

For example, just get a smaller natural diamond, or if budget is a problem get an off color L, M, N, O etc stone and save a lot of money. Or you can even buy a synthetic diamond or another gemstone like sapphire, etc. I would not buy a treated diamond at all.
__________________
Yosef Adde

Adylon Diamonds & Bridal Jewelry
358 N. First St. Burbank, CA 91502.
Yosef is offline   Reply With Quote
Old 05-09-2008, 06:10 AM   #5
Ricardo
Diamond Rookie
 
Join Date: May 2008
Posts: 3
Rep Power: 0 Ricardo is on a distinguished road
Default

It doesn't sound like a desirable process, based on the above information.

I wonder if it's most effective on smaller diamonds, as in clusters?
Ricardo is offline   Reply With Quote
Old 05-13-2008, 07:14 PM   #6
ken7700
Diamond Rookie
 
Join Date: May 2008
Posts: 8
Rep Power: 0 ken7700 is on a distinguished road
Default

My question does it fade over time or does it stay throughout the life of the diamond. You would think that it would fade after time. Does anyone know?
ken7700 is offline   Reply With Quote
Old 05-14-2008, 10:35 AM   #7
Yosef
Verified Diamond Dealer
 
Yosef's Avatar
 
Join Date: Sep 2001
Posts: 139
Rep Power: 13 Yosef is on a distinguished road
Default

Bleaching is a permanent treatment.
__________________
Yosef Adde

Adylon Diamonds & Bridal Jewelry
358 N. First St. Burbank, CA 91502.
Yosef is offline   Reply With Quote
Old 06-09-2008, 09:11 PM   #8
amol1980
Regular Member
 
Join Date: Jun 2008
Posts: 10
Rep Power: 0 amol1980 is on a distinguished road
Default

In order to increase the colorlessness of slightly colored diamonds, the process of color bleaching has been widely used. This method involves recreating high pressure and high temperature environments, in which diamonds were initially formed inside the earth. Treating diamonds with this technique can cause the color to improve by several grades.

These treatments are permanent in nature. But it is hard to detect color bleached diamonds. Many sellers even sell color bleached diamonds for the price of natural ones.
amol1980 is offline   Reply With Quote
Old 06-22-2008, 07:39 PM   #9
Mervyn L. Cohn ASA
Banned
 
Join Date: Jan 2005
Posts: 74
Rep Power: 0 Mervyn L. Cohn ASA is on a distinguished road
Default HTHP is as permanent as the original

Quote:
Originally Posted by amol1980 View Post
In order to increase the colorlessness of slightly colored diamonds, the process of color bleaching has been widely used. This method involves recreating high pressure and high temperature environments, in which diamonds were initially formed inside the earth. Treating diamonds with this technique can cause the color to improve by several grades.

These treatments are permanent in nature. But it is hard to detect color bleached diamonds. Many sellers even sell color bleached diamonds for the price of natural ones.
There is no reason to believe that an HTHP diamond will ever change color, but I've read recently that there could be vulnerability to cracking or fracture since the lattice could be stressed. The color lightening is the result of atoms of impurities Fe or Cr in the lattice of the Carbon molecule being replaced

HTHP = High Temperature, High Pressure
Mervyn L. Cohn ASA is offline   Reply With Quote
Old 09-29-2008, 01:35 PM   #10
GroomDude
Diamond Rookie
 
Join Date: Sep 2008
Posts: 8
Rep Power: 0 GroomDude is on a distinguished road
Default

Quote:
Originally Posted by Yosef View Post
Bleaching is a permanent treatment.
is bleaching diamonds common though?
GroomDude is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -8. The time now is 07:29 PM.
Powered by vBulletin® Version 3.7.3
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.