(Closed) Diamond tests as Moissanite.

posted 5 years ago in Rings
Post # 5
8042 posts
Bumble Beekeeper
  • Wedding: December 2013

I heard this too, moissanites are rather similar to diamonds in appearance. Maybe not in all circumstances, but when I saw one in a jewler’s case the other day it looked like a diamond to me.

Post # 7
393 posts
Helper bee
  • Wedding: March 2000

The diamond testers test moissanites positive as diamonds…..and vice versa. A jeweler proved this to me recently. Interesting. 

Post # 8
3101 posts
Sugar bee

@glitternails:  Jewelers have a little tool that produces either a positive or negative result (on whether it’s a diamond).

Here’s a Yahoo answer about how it works:

There are several types on the market the most common being the thermal probe. This instrument has a small tip which is heated by a battery, this is touched on the stone being tested. The rate at which it cools is measured by a circuit in the tester which gives a signal if the stone is diamond. This tester works because diamond is one of the best conductors of heat in the world. These testers are very good but can be fooled by moissanite.
Another type is a reflectometer, these are costly and have some definite drawbacks. This type works by measuring the light reflected from a facet on the stone and converting this into a refractive index number. The problems are that the stone must have a perfect polish and be absolutely clean, the slightest finger mark will throw the reading right out.
The cheapest type is a pen with a special ink. When you draw a line on the stone the ink will not form a proper line but only little dots if it is diamond but a solid line with other stones.
They all work within their limits but there is nothing like the experienced eye of a trained gemmologist.
None of these testers have the ability to tell the difference between natural and lab. created diamonds. This requires more sophisticated testing methods not available to the amateur.
Hope this helps a little.

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