As per Ratna Pariksha - A Real diamond cannot be scratched by any other stone by not even ruby. Once I found a stone (Imitation Diamond made of glass), I took that to my Nanaji (mother's father) and asked him if it could be a diamond. He had quickly worn a watch makers lens and possibly scratched the diamond with a sharp plucker tool. It scratched the stone very easily. He said "It is not a diamond, it is possibly ordinary glass, Real diamond can be scratched only with another diamond"
So, if you find a transparent white stone when travelling to a remote place scratch it with another stone, if you are not able to scratch it....... you know now it could be worth putting that in your bag. (I do not know if the stone could become legally yours)
Note: Don't try this with a polished stone, you can spoil it. This test was used in the past somewhere beyond 100 years and over and is only handy when identifying a raw diamond stone. Just hope you do not touch a raw diamond with the sharp tool on the best edge. It can cost you a fortune
I've read about other methods as well. But, so far have not tested their authenticity:-
- When you place a real diamond on your eyelids it feels cool and does not get warmer soon. While this is not so in case of a ordinary stone.
- Real diamond does not loose its shine on wearing it.
- Real diamond is dense, when you take another stone of the same size you will feel the real diamond heavier.
2 comments:
Ganesh, as I responded to your post on this in rec.crafts.jewelry, while hardness of diamond is indeed unique, it should not be the test with a cut and polished stone. Diamond is hard, but it CAN be damaged if you're not careful, and some of the softer stones you might scratch, determining that they are not diamond, might be valuable in their own right. Simply don't use this test. A good 10x corrected lens eye loupe and some practice at what to look for are all you usually need. For your other points, diamond is highly thermally conductive, so your eyelid might feel cooled by a larger stone. But this is a poor test. The commercial thermal diamond testers are cheap, and much more accurate at testing this property. And a few gems, like moissonite, are almost as thermally conductive as diamond, and can fool you if you are not careful. Diamond is hard, so it doesn't get as worn and scratched as softer stones like glass when worn over time. But there are other stones which may appear to also not get scuffed, especially if the wearer has been careful. As to density, diamond is denser than some stones, but less dense than others. Cubic zirconia, for example, is considerably denser than diamond. You have to measure the actual density (or more properly, the specific gravity) for real information. For the other gems, though, often the weight of the stone won't match what the diameter or dimensions suggest a diamond should weigh, so that too can be useful, especially with those stones, like CZ, which are a lot different from diamond.
Hi Peter,
Thanks for visiting and clarifying. I am researching old gemological, and mineralogical methods. The above post was just a part of of the research activity. I have added a big caution note. You are right about someone actually trying this today.
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