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volemus
Community Member
Posts: 547
Registered: ‎11-15-2004

Re: How accurate is a Presidium Gem Tester?

in reply to bojibelle

I knew I was exhausted so I didn't want to touch it either.

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bojibelle
Community Member
Posts: 1,143
Registered: ‎08-03-2004

Re: How accurate is a Presidium Gem Tester?

in reply to bwrighttwo

bwrighttwo wrote:

carols5294 wrote:

.  Lab created gemstones are identical to natural gemstones in every way except they are flawless.  That's the only way a gemologist can tell the difference in lab-grown and natural.


Uh Oh......Hanging curve ball.  Can't wait to see who jumps on this.


I'm not touching it.  I've tried way to many times to explain natural, synthetic, lab-created and simulated and what the tester will and won't test.

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Community Member
Posts: 623
Registered: ‎01-11-2009

Re: How accurate is a Presidium Gem Tester?

in reply to carols5294

carols5294 wrote:

.  Lab created gemstones are identical to natural gemstones in every way except they are flawless.  That's the only way a gemologist can tell the difference in lab-grown and natural.


Uh Oh......Hanging curve ball.  Can't wait to see who jumps on this.

___________________________________________________
Some should name the chip that resides on their shoulder "Hypocrite"
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carols5294
Community Member
Posts: 4
Registered: ‎05-14-2005

Re: How accurate is a Presidium Gem Tester?

in reply to elias11

This tester will tell you if a stone is a diamond or Moissinate but none in this price range will tell you the difference between the two.  You will also get a slightly lower reading for sapphire, ruby or emerald.  I use one very frequently and it's reliable if you calibrate it properly.  If a stone is synthetic, you will not get a reading or signal.  If it's natural or lab-grown, you will get a signal.  Lab created gemstones are identical to natural gemstones in every way except they are flawless.  That's the only way a gemologist can tell the difference in lab-grown and natural.

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bojibelle
Community Member
Posts: 1,143
Registered: ‎08-03-2004

Re: How accurate is a Presidium Gem Tester?

in reply to vintage-memories

vintage-memories wrote:

Can you suggest how to keep it calibrated, please.


Read the directions

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vintage-memories
Community Member
Posts: 7
Registered: ‎04-19-2006

Re: How accurate is a Presidium Gem Tester?

I enjoyed your explanation... I'll give my tester another try. Thanks.
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vintage-memories
Community Member
Posts: 7
Registered: ‎04-19-2006

Re: How accurate is a Presidium Gem Tester?

in reply to pan2roc

Can you suggest how to keep it calibrated, please.

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vintage-memories
Community Member
Posts: 7
Registered: ‎04-19-2006

Re: How accurate is a Presidium Gem Tester?

in reply to elias11

When I purchased my gem tester and first used it I was very dissapointed.  The only good reading I got was on the diamonds.  Also, it identified "glass", which was helpful. I did not realized it detected synthetic stones.  I am thinking of selling it and I'm sure I will not get the same price I paid for it...too bad...I should have researched it a little better. 

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vintage-memories
Community Member
Posts: 7
Registered: ‎04-19-2006

Re: How accurate is a Presidium Gem Tester?

in reply to wharper

I use the MIZAR diamond tester and like it very well.  I have had it for ages and always carry it in my purse.  One never knows when one will have the opportunity to see some "gems" and hope they are diamonds. I use mine all the time

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bojibelle
Community Member
Posts: 1,143
Registered: ‎08-03-2004

Re: How accurate is a Presidium Gem Tester?

in reply to bclear0693

No, they do not have a test rating for opal.

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Community Member
Posts: 3
Registered: ‎08-07-2009

Re: How accurate is a Presidium Gem Tester?

You are very knowleagable about these testers.  Can you tell me if a tester can tell opal from quartz?  Or opal from glass?

 

Thank you

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bojibelle
Community Member
Posts: 1,143
Registered: ‎08-03-2004

Re: How accurate is a Presidium Gem Tester?

in reply to rixstuff

Yes, the  Presidium doesn function as a diamond tester.  As far as CZ and glass, I don't think it does, both will register as glass.

If you are only concerned with diamond testing there are other testers that work great for that and cost less.

 

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rixstuff
Community Member
Posts: 2,176
Registered: ‎09-04-2011

Re: How accurate is a Presidium Gem Tester?

in reply to elias11

elias11 wrote:
Unfortunately, any gem tester will not separate natural gemstones from their synthetic counterparts. (a synthetic sapphire that costs $20.00 will test the same as a natural sapphire that's worth $2,000.00).

In my opinion, these testers have a very limited capability, and are practically useless for positive gem identification.

Elias


Perhaps but it WILL tell me a CZ from glass from a real diamond.  Thats all I need to know.

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bojibelle
Community Member
Posts: 1,143
Registered: ‎08-03-2004

Re: How accurate is a Presidium Gem Tester?

in reply to abddi.abddi

There is NO machine that is 100% accurate in testing gemstones whether rough or cut.

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Community Member
Posts: 1
Registered: ‎03-02-2014

Re: How accurate is a Presidium Gem Tester?

in reply to beachbum8167

We are a Registered Rays Mining & General Trading Company in Africa particularly in East Africa & Horn of Africa and we are supplier for Rough Gemstones, Sand mixed with Gold - etc. We are looking for an accurate Machine for testing Rough Gems 

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Community Member
Posts: 1
Registered: ‎12-07-2013

Re: How accurate is a Presidium Gem Tester?

in reply to no1engr

 

Yes, Sapphires (Corundum) comes all colors, wh, gr, bl, ye, bl, pk, or, gr\bl rd (Rubies.)

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Community Member
Posts: 1
Registered: ‎12-04-2013

Re: How accurate is a Presidium Gem Tester?

in reply to trlosi
white sapphires?
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Community Member
Posts: 7
Registered: ‎09-10-2013

Re: How accurate is a Presidium Gem Tester?

in reply to jewelscollectingdust

Hello,

I was looking the presidium gem tester online and it directed to your article.  I have a refractometer and have been collecting for 35yrs.  In my opinion this is just a more portable refractometer, as it work about the same, maybe a llittle better..  It is a tool to make sure you do not have glass or a quartz based copy.
I had someone use the tester on a few pieces of my jewelry and it was all over the place. I actually knew what the pieces were but wanted to check and see if this tester would be easier than ,y refractometer.  I left feeling the person did not have a clue about gemstones.

Thank you for the information.

Ann

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pre1840lorraine
Community Member
Posts: 2,079
Registered: ‎12-11-2007

Re: How accurate is a Presidium Gem Tester?

in reply to stncutr

stncutr wrote:

Thank you for your informative comments.

 

I am interested to know whether or not this tester can be used on gemstone rough.

 

Thank you.

 


Yes, but Like I said earlier, it can not say without a doubt what it is, it can only give you an idea and the hardness of the stone. It takes more than just this instrument to know 100% what the gemstones are. It can rule out glass but that is about all 100%.

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Community Member
Posts: 1
Registered: ‎12-31-2010

Re: How accurate is a Presidium Gem Tester?

Thank you for your informative comments.

 

I am interested to know whether or not this tester can be used on gemstone rough.

 

Thank you.

 

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