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diamond testing
Posted by: mike k.
Date: January 10, 2019 02:58PM
Ok ,I tried my diamond tester on a few rings and I know that when it climbs up to red and flashes -its a diamond . Other times , if its glass ,it doesnt move much . But what is it if it stops just before the diamond alert ?? - thanks

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Re: diamond testing
Posted by: bootyhoundpa
Date: January 10, 2019 04:55PM
Ive only ever owned one tester and it recently died but i do recall that something called moissanite can come close to mimicking diamond readings..

Re: diamond testing
Posted by: Flintstone
Date: January 10, 2019 05:58PM
GOOD GLASS???

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Re: diamond testing
Posted by: WaterWalker
Date: January 10, 2019 07:14PM
Depending on the tester, battery, temperature, cleanliness of the stone's surface and initial setting you will see slightly different results.

Older testers will evaluate moissanite and diamonds as the same, no questions asked.

Newer testers will first test the thermal conductivity to determine if a stone is moissanite / diamond OR not. Then the tester will test the moissanite / diamond resistivity to differentiate between the two.

No electronic tester that I have used will tell if the stone is glass (junk) or a semiprecious stone such as white topaz. When you get that specific reflectivity is the way to test the stone. Don't discard the stone just because a tester shows it is not a diamond. Also don't be fooled with black, brown, green and other colored stones as they just may be a diamond! - even if they are set in silver.

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Re: diamond testing
Posted by: Champ Ferguson
Date: January 11, 2019 12:16PM
Quote
WaterWalker
Depending on the tester, battery, temperature, cleanliness of the stone's surface and initial setting you will see slightly different results.

Older testers will evaluate moissanite and diamonds as the same, no questions asked.

Newer testers will first test the thermal conductivity to determine if a stone is moissanite / diamond OR not. Then the tester will test the moissanite / diamond resistivity to differentiate between the two.

No electronic tester that I have used will tell if the stone is glass (junk) or a semiprecious stone such as white topaz. When you get that specific reflectivity is the way to test the stone. Don't discard the stone just because a tester shows it is not a diamond. Also don't be fooled with black, brown, green and other colored stones as they just may be a diamond! - even if they are set in silver.

^^^^^^^^ correct answer. Tho I think you meant to say Index of Refraction or specific gravity instead of reflectivity .


edited for spaillin.



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Edited 2 time(s). Last edit at 01/11/2019 12:17PM by Champ Ferguson.

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Re: diamond testing
Posted by: WaterWalker
Date: January 11, 2019 02:37PM
Thanks, Any day I do not learn something is a wasted day. You made my day today!

Re: diamond testing
Posted by: GeorgeinSC
Date: January 11, 2019 06:48PM
A few years back I found a "Diamond Rin g" at the beach. Brought it home and tested it with my diamond tester. It screamed diamond. I took it to a local jewelry store and the young lady studied it carefully, tested it with their professional diamond tester and said that it was a real diamond and of very high quality.

I was later in a jewelry shop in another state to get the battery in my watch battery changed and in talking to one of the ladies who worked there the subject of detecting came up. Her husband detects. I later had to go back to the shop to get the band on my watch repaired and took some of my finds to show her.

The Gemologist asked if he could look at my "Diamond Ring". He kept studying it with his loupe and then used his diamond tester. He said I don't think that it is a diamond as I am seeing too much color and light transmission. He then used his tester for moissanite and it tested positive.

So my fortune from that ring disappeared. He did say that his cost on a 14k Moissanite ring like mine would be between 5 and 6 hundred dollars.

So diamond testers that are not testing for Moissanite will say that it is a diamond.



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