I have a very tough black stone ,the photos are below, I thought it was a meteor , But when I tested it by quartz and sapphire, the stone wasn't even scratched with sapphire . it didn't attract to magnet , it's dark stone and doesn't translucent even though I tested it by light . So I wonder if it could be a black diamond? it's weight 343 gr. Thanks million .
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Suspected black diamonds are a pretty common refrain with this sort of find, second only to suspected meteorites. Just as a word of warning, they unfortunately pretty much never turn out to be black diamonds or meteorites, so you shouldn't go into this expecting that to be the answer. It is really easy to get the wrong reading on a hardness test, especially (in my experience) when you kind of want to get a particular result. I don't say this to try and tear you down at all, just to help manage expectations.
Joined: Sun Oct 16, 2005 12:22 pm Posts: 21602 Location: San Francisco
Big black masses will test as "diamond" with a thermal diamond tester if they are indeed diamonds. Most jewelry stores have a thermal tester.
As Stephen said, regardless of color or character most folks who find unknowns presume there's a good chance it could be a diamond and if not a diamond, must be a meteorite.
Unless it is red, green or blue slag glass. I'll say no more.
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