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www.reference.com/world-view/identify-raw-diamonds-91b6c9f667bb4c53

Scratching another stone with a suspect diamond is an excellent test of authenticity. Scratching determines the hardness of the stone, which is a key identifying characteristic for diamonds. A raw diamond looks similar to the expertly cut stones adorning necklaces and rings. At first glance, a rough diamond resembles common quartz or calcite.

sciencing.com/identify-uncut-rough-diamond-7627586.html

Diamonds form isometric crystals, have a specific gravity of 3.1–3.5, rank 10 on the Mohs Hardness Scale, stick to a grease table, and, in some cases, fluoresce under shortwave ultraviolet light. Correctly identifying an uncut rough diamond uses a combination of these characteristics.

www.wikihow.com/Identify-Raw-Diamonds

Diamonds which have not yet been cut are referred to as 'rough' or 'raw' diamonds. To identify whether the stone you have is a diamond, you can do a quick visual evaluation to rule out other gemstones. From there, you’ll want to perform a more precise test with a piece of corundum or an electronic diamond tester.

www.jewelrynotes.com/what-are-rough-or-raw-diamonds-and-how-to-identify-them

Perhaps you’ve heard or read about rough diamonds (or raw diamonds, as some people call them). If you’re wondering how these stones are different from the ones regularly sold in the jewelry store, read on. Let’s see what rough diamonds are, how you can identify them, and whether you can buy a rough diamond.

johnbetts-fineminerals.com/jhbnyc/diamondtest.htm

So do not try scratching glass with the suspected diamond. The only hardness test that will identify a diamond is scratching corundum.Corundum, which includes all rubys and sapphires, is 9 on the hardiness scale. If your suspected diamond crystal can scratch corundum, then there is a good chance that you found a diamond.

www.thediamondauthority.org/how-to-identify-a-raw-diamond

Uncut rough diamonds look very similar to water-worn quartz pebbles. However, there are other rocks that can be mistaken for raw diamonds by people who do not know how to spot the precious material. Luckily for people who want to learn how to identify a raw diamond, there are various ways to identify a raw diamond with a high degree of certainty.

ourpastimes.com/identify-raw-diamonds-6310130.html

The raw gems that a person finds in a mine or laying around on the ground have different characteristics that make them stand out. This is especially true for diamonds, which are much different in their raw form than they are once they've been cut, polished and set in a diamond engagement ring.

sciencing.com/test-raw-diamonds-7640072.html

How to Test and Find Raw Diamonds ... Looking in the right places and knowing what to look for may yield a raw diamond. Diamonds have specific characteristics that set them apart from other gemstones, and tests can confirm whether what you’ve found is actually a diamond.

ourpastimes.com/identify-raw-gems-2042153.html

How to Identify Raw Gems. Some gems in their raw state, such as diamonds and pearls, are just as attractive as a finely cut and polished stone. For other gems, it takes a keen eye to spot and identify them as a gem at all. Often times you will walk right past a raw gem, unless you know how to identify it.

www.youtube.com/watch?v=llCxJR7gBvo

about Rough Diamonds - The Ultimate Diamond Documentary 2017 ... Where to find diamonds, How to identify rough diamonds and how to recover raw diamond crystals - Duration: 43:30.