January 24 Through February 4—TUCSON, ARIZONA: Annual show
Welcome to the GemologyOnline.com Forum
A non-profit Forum for the exchange of gemological ideas
It is currently Fri Mar 29, 2024 1:56 am

All times are UTC - 4 hours




Post new topic Reply to topic  [ 7 posts ] 
Author Message
 Post subject: Help Please...!!!
PostPosted: Wed Mar 29, 2006 4:55 pm 
Offline
New to the Forum or The Quiet Type

Joined: Wed Mar 29, 2006 4:43 pm
Posts: 1
I'm not sure this is the right forum... but I need help with the following: I need to know the exact weight of an emerald cut diamond mounted in a bracelet. I have the measurements but I CAN'T take the stone out of the piece.
What is the factor that I need to multiply by length X with X depth... ???
please help!!! :?
thanks


Top
 Profile  
Reply with quote  
 Post subject:
PostPosted: Wed Mar 29, 2006 5:21 pm 
Offline
Moderator

Joined: Sun Oct 16, 2005 12:42 pm
Posts: 2846
Location: Ho Chi Minh City, Vietnam
Try here : http://dendritics.com/scales/carat-weight.asp

It won't be exact unfortunately, because of cut variations that might be present.


Top
 Profile  
Reply with quote  
 Post subject:
PostPosted: Thu Mar 30, 2006 12:04 pm 
Offline
Site Admin
User avatar

Joined: Sun Oct 16, 2005 12:22 pm
Posts: 21602
Location: San Francisco
In many cases, I've had more accurate results using the standard weight estimation formulas. I played with a handfull of various stones last year that were loose and checked them against the dendritics site and the simple old formulas.
Check :
http://gemologyonline.com/carat_weight_estimation.html

I'd recommend trying both. :wink: Do note, that the weights you get are just approximations! They are NOT precise. Usually one can get within 10%, with a little practice...


Top
 Profile  
Reply with quote  
 Post subject:
PostPosted: Tue Dec 05, 2006 6:29 pm 
Offline
Established Member
User avatar

Joined: Tue Dec 05, 2006 1:10 pm
Posts: 14
Location: Charlotte, NC
There's also a great book out called The Complete Handbook for Gemstone Weight Estimation by Charles I. Carmona, G.G. that I find very helpful. The ISBN is 0966637003.


Top
 Profile  
Reply with quote  
 Post subject: Excellent Reference Work!
PostPosted: Thu Feb 08, 2007 8:40 pm 
Offline
Valued Contributor

Joined: Wed Jan 03, 2007 11:21 pm
Posts: 120
Location: Las Vegas, NV
barkingowl wrote:
There's also a great book out called The Complete Handbook for Gemstone Weight Estimation by Charles I. Carmona, G.G. that I find very helpful. The ISBN is 0966637003.


This work is just about a MUST HAVE for anyone doing weight estimation on a regular basis. "Guessing" will get you into a world of trouble and there is no substitute for accuracy in weight estimation. :)

_________________
Best Regards From,
Tom Goodwin, G.G.

"Always do the right thing. Your friends will be gratified and your enemies amazed." -Mark Twain


Top
 Profile  
Reply with quote  
 Post subject:
PostPosted: Fri Feb 09, 2007 1:58 am 
Offline
Gemology Online Royal Princess

Joined: Mon Oct 17, 2005 10:56 am
Posts: 6461
Location: The frozen north prairie :-/
And you can buy it through the Gemology Online Book Shop!! :D

_________________
IIJA Registered Gemologist
GIA Graduate Gemologist


Top
 Profile  
Reply with quote  
 Post subject:
PostPosted: Fri Feb 09, 2007 11:18 am 
Offline
Site Admin
User avatar

Joined: Sun Oct 16, 2005 12:22 pm
Posts: 21602
Location: San Francisco
I've been using Gemology Tools Professional for weight estimation.

It's very accurate. And you can do diamonds as well as hundreds of other gems.

It is not available thru the bookshop, but I have a link directly to the maker of the software on my book shop's page:
http://gemologyonline.com/books.html
If you haven't checked this program out, you should. For awhile they were offering a free trial download. I don't know if that is still in effect....but you could ask.


Top
 Profile  
Reply with quote  
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 7 posts ] 

All times are UTC - 4 hours


Who is online

Users browsing this forum: No registered users and 23 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group
Gemology Style ported to phpBB3 by Christian Bullock