Yes.
Diamonds conduct heat so you can test them with a diamond tester.
Have you ever heard of the Moh's scale? I believe quartz ranks 7 and diamond 10. If you can obtain topaz which is more common then Corundum and it leaves a streak on the mineral then the mineral is Quartz, but if the topaz or coundum is scratched then it is indeed a valuable diamond.
Diamond substitutes are usually not made out of glass. But if you have doubts, bring it to the jewelry store, they will test is with a small tester for diamonds and determine it.
The best way to identify a diamond is to use a diamond tester. It is a handheld device which sends a thermal beam (heat) inside the stone and reads how fast the stone conducts the heat. Each mineral has a different heat conductive coefficient so this way you can tell a diamond from other stones. However, a moissanite (a withe stone grown in the lab) has the same response as a diamond so a diamond tester may confirm the moissanite as a diamond. Recently, a moissanite tester has been developed , so it can differentiate a diamond from a moissanite. Also a moissanite turns deep yellow when heated with a torch then turns back to white when cools down. Also, it is possible that a trained eye can see a greenish color it the moissanite.
shattered diamond in the rough
You can apply a diamond tester to anything else, but the information you read on the instrument will be meaningless, unless you are testing a diamond.
An uncut diamond can be 'field tested' for its extreme hardness. Also, you may be able to see light through it, since diamonds are essentially transparent -- to light. Diamonds conduct electricity, so a diamond tester probe would confirm that the raw stone is a diamond.
Testers were people who tested the game. The game is not testing now, so you cannot be a tester.
Diamonds conduct electricity, and your local jeweler probably has a diamond tester that uses this characteristic to tell real stones from the fakes. You can take your black diamond in and ask that the stone be tested. Edit From Siddharth Nayak: Also, if a diamond tester tries to get payed for his/her services, there is a quicker, faster, and free way: simply hold the diamond out in the sun, and if it gets hot, then it is glass, if it stays normal temperature, it is a diamond...but then again, it might be simply coated with diamond and internally glass... -Siddharth Nayak
Rough Diamond - album - was created in 1977.
Diamond in the Rough - album - was created in 1976-07.
A Real Diamond in the Rough was created on 2009-05-01.
Rough Cut Diamond was created on 2009-07-22.
Rough Diamond - 2006 is rated/received certificates of: Australia:PG
Diamonds conduct heat so you can test them with a diamond tester.
A thermal diamond tester is a tool used by anyone interested in verifying that a gem is indeed a diamond. The tool uses electronics connected to a probe with a fine tip that reads the stone's level of thermal conductivity to positively or negatively test for the mineral diamond.
A continuity tester determines if an electrical path can be established between two points. This is a great tool for mechanics, architects, and electricians.