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This article was co-written by Kennon Young. Kennon Young is a GIA graduate gemologist and JA jewelry technician. He received the highest certification in the jewelry appraisal industry, the ASA Gemologist in 2016.
There are 11 references cited in this article that you can view at the bottom of the page.
This article has been viewed 3,563 times.
Rough diamonds are diamonds that have not been cut. To see if the stone in your hand is a diamond, you can make a quick visual assessment to rule out other gems. You can then perform more precise tests with corundum or an electronic diamond tester. You can also perform a gravimetric test of the stone to determine if it is a diamond.
Steps
Do simple tests at home
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Look at the stone from the top and count the edges. Diamond has a cubic crystal structure, while stones similar to quartz have a hexagonal shape. Look down at the top of the stone and count the edges. If you can count the 4 sides, it is likely that the stone is a diamond. If there are 6 edges, it is probably quartz. [1] X Research Source
- Visual inspection is a quick way to rule out other gems but is not an accurate test.
- If you see four edges of the crystal, use other methods to determine for sure it is a diamond.
Diamonds can come in many shapes, but the most common is a pyramid-like 12-sided block whose floors are stacked on top of each other.
Kennon Young
Gemstone Expert
Kennon Young is a GIA graduate gemologist and JA jewelry technician. He received the highest certification in the jewelry appraisal industry, the ASA Gemologist in 2016.
Kennon Young
Gemstone Expert
Gemstone Expert
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Rub the stone against a piece of corundum. Corundum is another stone that is slightly less hard than diamond. You can buy a cheap piece of corundum rock or buy a mineral test kit with corundum in it. Hold the piece of corundum firmly on the countertop and rub the suspected diamond into the corundum. If scratches appear on the corundum, the stone under test is a diamond. If there are no stains, the stone is another mineral. [2] X Research Source
- The Mohs hardness scale ranks minerals based on their hardness. Diamond is ranked 10th on the hardness scale, and corundum is 9th. This explains why it creates scratches when you rub two stones together.
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Use a diamond tester instead of the scratch test. You can buy diamond testers online. Check the green light to make sure the device is fully charged. Press the tip of the test pen against the suspected diamond. If the tester makes a chirping sound and the light comes on, the stone is a diamond. If not, it could be another gem. [3] X Research Sources
- Diamond testers use electrical and thermal conductivity to determine if a gemstone is a diamond.
- Cheaper diamond testers may not be as accurate as more expensive models.
- Read customer reviews before you buy a diamond tester.
Perform density test
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Weigh the stone with an electronic scale and record its weight. You can buy electronic scales online. Place the ice cube on the scale and record the weight on a piece of paper. [4] X Research Sources
- Some types of electronic scales are more accurate than others. You should look for scales that have at least 2-3 decimal places after a whole number.
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Fill a beaker with water and adjust the scale to zero. Pour water into a paper or plastic cup so that it is enough to cover the ice cube. Then you put the water cup on the scale and press the “tare” button to return the display to 0. [5] X Research Source
- Returning the scale to zero is to determine the density of the diamond without taking into account the weight of the cup and water.
- If you don’t have a plastic cup, you can also use a lightweight Tupperware container or plastic bowl.
- Make sure the container does not protrude beyond the edge of the scale.
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Wrap a paper clip around the stone so you can keep it in the air. To determine the density of an ice cube, you must keep it suspended in water without sinking to the bottom or touching the sides of the cup. Straighten a paper clip and wrap one end around the widest part of the stone to secure. Lift the other end up so that the stone is suspended in the water. [6] X Research Sources
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Submerge the stone completely in the water and record the weight. Hold the other end of the paper clip and dip the ice cube into the water, making sure it doesn’t touch the side or bottom of the cup. Record the weight on the same sheet of paper you wrote down the weight of the stone before. [7] X Research Sources
- If you let the stone touch the bottom of the cup or the side of the cup, the scale will give an incorrect measurement.
- The weight of the paperclip head is negligible.
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Divide the weight of the stone by its own weight in the water. When you divide the weight of the stone by its weight in the water, you get the density of the stone. Diamond has a density of 3.5 – 3.53 g/cm3. If the result of the calculation is less than this number, the stone is a different gemstone. If the result is close to this number, your stone is most likely a diamond. [8] X Research Sources
- For example, if the stone weighs 12.6 g and its weight in water is 4.8 g, the result of the calculation will be 2.625, which is approximately the density of quartz, not diamond. [9] X Research Source
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Determine if the density of the stone is between 3.5 – 3.53 g/cm3. Maybe you have a diamond in your hand if the calculation gives a number between 3.5 – 3.53g/cm3. For example, if your stone weighs 16.84 g and the weight of the stone in water is 4.8 g, you would do the calculation 16.84 g/4.8 g = 3.51 g/cm3. This result shows that your stone has a density that matches that of the diamond.
- If you determine that you do have a diamond, take it to a gemologist.
Implement other test methods
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Determine if the diamond originated near the kimberlite tubes. Kimberlite tubes are volcanic rocks, formed from molten magma and can be found below ground level. Natural diamonds are mostly found in kimberlite tubes. If your diamond comes from a tube of kimberlite, there’s a good chance it’s a diamond and not another rock. [10] X Research Source
Kennon Young
Gemstone Expert
Kennon Young is a GIA graduate gemologist and JA jewelry technician. He received the highest certification in the jewelry appraisal industry, the ASA Gemologist in 2016.
Kennon Young
Gemstone Expert
Gemstone Expert
Diamonds can also be found in water. Diamonds were discovered in the cratons, the oldest base of the earth’s crust. Diamonds can also emerge from cratons and drift with currents, so they are also found in currents or in the ocean at the end of the stream.
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Use a microscope or magnifying glass with 10x magnification to get a closer look at the stone. A magnifying glass is a special type of jeweler’s magnifying glass. Place the diamond under a magnifying glass or microscope to look for rounded edges with tiny concave triangles. Cubic diamonds, on the other hand, have parallelograms or rotating squares. Real diamonds look like they have a layer of vaseline wax on the outside. [11] X Research Source
- Cut diamonds will have sharp edges.
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Take your diamond to a professional for assessment if you’re still unsure. If you have done the tests and think that the stone you have in your hand is a diamond, have it examined to make sure it is real. If you are in the US, you may also be able to obtain a certificate of authenticity and a specific report number through GIA or another diamond assessment organization. [12] X Research Source
- Having a diamond assessed is the surest way to determine if a stone is a diamond.
Things you need
Identify rough diamonds
- Corundum
- Diamond tester
Do a gravity test
- Electronic scales
- Glass
- Water
- Paper
- Pen
- Computer
Implement other test methods
- Microscope or magnifying glass
X
This article was co-written by Kennon Young. Kennon Young is a GIA graduate gemologist and JA jewelry technician. He received the highest certification in the jewelry appraisal industry, the ASA Gemologist in 2016.
There are 11 references cited in this article that you can view at the bottom of the page.
This article has been viewed 3,563 times.
Rough diamonds are diamonds that have not been cut. To see if the stone in your hand is a diamond, you can make a quick visual assessment to rule out other gems. You can then perform more precise tests with corundum or an electronic diamond tester. You can also perform a gravimetric test of the stone to determine if it is a diamond.
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