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 1:09 am

All times are UTC - 4 hours




Post new topic Reply to topic  [ 3 posts ] 
Author Message
 Post subject: Buying Flaws for Beginners
PostPosted: Sun Apr 15, 2012 12:46 pm 
Offline
Valued Contributor
User avatar

Joined: Tue Dec 20, 2005 4:36 am
Posts: 283
Most aspiring gem-lovers are overwhelmed by the depth and width of the market. If they have been confused in a B&M jeweler, a quick web-search is going to do the rest. But, alas, there is no competence for the lazy. Selecting antiques, real estate or vintage cars requires homework too.

101 buying guides offer good reading and places like this help. Be prepared to spend weeks in a fog but do not despair. Collecting gems is a passion and the learning never ends.

Here is a fresh perspective for the determined beginner. It comes out of a thousand discussions with early stage buyers and their consecutive decisions.

First allow this axiom: “No natural gem is perfect.”

The deeper your knowledge the better your choices will get, but there is no final word. All veterans know this.

Consider that 95% of what comes out of a mine goes straight back into the pit. Most rough material is too small, too included, too dull or too unshapely to be cut into gemstones.

Only the remaining 5% make it into sales and they all are flawed.

It is those flaws that need attention: Evaluating gemstones means recognizing imperfection.

Here is an exemplary list of common flaws rated with negative numbers:

1. Clarity: From lens-only bubbles (-1) to visible black inclusions (-3)
2. Window: From small and symmetric (-2) to big and uneven (-5)
3. Color-zoning: From faint (-1) to dramatic (-2)
4. Cutting: From not-precise (-2) to native egg-shape (-5)
5. Treatment: From heat-only (-1) to surface coating (-10)
6. Color: From off-ideal (-1) to pale or dark (-5)

Remarks:
1) A terrible gem could here, theoretically, make it to minus 30. Yuk!
2) Color includes tone and hue

This individual list has no fixed reference. You can add or disregard issues or give reverse ratings. It needs to look different for cat’s eyes, pairs or color changers; in fact, the list will look different for every single purchase.

Professionals make this kind of evaluation automatically and in seconds.

You need not to be that fast. Also, you need not think of anything other than what you want or like; and that is entirely up to you. You may find a specific color perfect and some treatment acceptable while other buyers might not be interested in the same stone for half the price.

As always, if you want what everybody wants you need to dig deeper.

Imagine the one elusive but perfect stone. It would have no window (not even a tilt window), be free of inclusions, but not synthetic, have no color-zoning, sport an art-full precision-cut, be untreated and have exactly the hue you want it in and in exactly the right tone. Plus, it needs be in the desired size and shape, have ideal proportions, be of your preferred origin and have a perfect certificate. And it must be for sale at an affordable rate.

Back to reality: On the one side we have a set of negotiable flaws. On the other side we have restrictions in budget and time. A successful purchase needs to balance these two sides (only eternity or unlimited budgets are excused).

Practically, you might be shopping for a round yellow sapphire in 2 carats and you need to order soon. The web shows legitimate offers between 250 and 2000.

Study the flaws that make the difference between 250 and 2000.

A terrible window may bring you from 2000 to 1000, a pale hue downs it to 500 and heat may bring you to 250.

Below 250 (e.g. bad window, pale, BE-treated and included) the definition of gem-quality sapphire gets shaky.

If you like numbers you may actually chart your alternatives with prices and flaws on a rough scale.

In the end, I advice to follow your heart, not the numbers.

Remember: “There is always a better one”.

_________________
Edward Bristol
http://www.WildFishGems.com & http://www.EdwardBristol.com
Exclusively Untreated Gemstones


Top
 Profile  
Reply with quote  
 Post subject: Re: Buying Flaws for Beginners
PostPosted: Sun Apr 15, 2012 2:22 pm 
Offline
Valued Contributor
User avatar

Joined: Tue Sep 02, 2008 9:34 pm
Posts: 169
Location: Shoreview, MN
Edward -

Nice summary on gem evaluation. I wish I was more analytical when I am buying, so the point system might be a good way to evalute gems. Sometimes my emotions are way out in front of my analysis.

I think that the quote:
Edward Bristol wrote:
First allow this axiom: “No natural gem is perfect.”

is followed by the corallary: If it is perfect (at a great price) it is probably not natural. You mention this as well, but if I see a "great deal" there are alarms going off in my head. "Caveat emptor" is a good place to start.

That being said I have a ways to go .... I already have a number of "great buys" in my inventory (fishtank) :-)

- STEVO

_________________
Steve Wallner
Westview Gems
www.westviewgems.com


Top
 Profile  
Reply with quote  
 Post subject: Re: Buying Flaws for Beginners
PostPosted: Sun Apr 22, 2012 1:36 pm 
From a visual point of view, I would say windowing is the biggest flaw new buyers will ignore. Possibly followed by "too dark" (especially at trade shows, where the lighting can be very, very bright/flattering). It would have to be very miss-cut for miss-shapen-cutting to be a big factor for beginners.

I think most absolute beginners will basically just look at colour, size/weight, price and clarity. I think many especially obsess over clarity.

As for the numerical system, with a stone I'd quantify it less, and go more on 'feel'. There are x-factors involved that can't necessarily be quantified. However, I would agree with the large windows and over-darkness being the biggest negative point-scorers. They both kill a stone dead.

It varies from material to material, but the list of visual "compromises" I would be willing to make for a faceted stone would roughly be as follows (top of list is what I tolerate the least):

Translucency/Opacity
Too Dark
Windowing
Inclusions/Fractures
Bad Cutting
Colour-Zoning
Too Light
Cut I Don't Like (checkerboard, some concave cuts, etc.)
Small Size

So, basically:

- I am very willing to down-size in order to have a "quality" stone.
- "Life" issues are generally more important to me than "colour" issues or "flaw" issues.
- I hate translucent, faceted stones with a passion. Especially common in emeralds and cheap rubies. Pointless.


Top
  
Reply with quote  
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 3 posts ] 

All times are UTC - 4 hours


Who is online

Users browsing this forum: No registered users and 12 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