As a gemologist with years of experience in the field of gemstone identification, I can share with you several methods to determine if a diamond is genuine or not. It's important to note that while some tests can be done at home, others require professional equipment and expertise. Here are some of the ways to tell if a diamond is real:

Visual Inspection: Start by examining the diamond with the naked eye. Real diamonds have a unique sparkle and brilliance due to their high refractive index. Look for a clear and sharp image when looking through the diamond.

Use a Diamond Tester: A diamond tester is a device that can detect the thermal conductivity of a diamond, which is very high. If the tester beeps or lights up, it indicates the stone is likely a diamond.

Breath Test: The breath test is a simple method where you breathe on the diamond. If it fogs up and takes time to clear, it's likely not a real diamond. Real diamonds do not hold heat and will clear quickly.

Dropping into Water: Due to the high density of a diamond, when dropped into water it will sink. If the diamond floats to the top or middle of the glass, it's likely fake. However, this method is not entirely reliable as other materials with similar density might also sink.

Scrape Test: Real diamonds are one of the hardest substances on Earth. Try to scratch a piece of glass with the diamond. If it leaves a mark, it's likely a fake, as real diamonds should not scratch glass.

Check for Fluorescence: Some diamonds will fluoresce under ultraviolet light. Use a UV light to see if the diamond glows. While this is not a definitive test, it can be a helpful indicator.

Consult a Professional: For the most accurate assessment, take your diamond to a certified gemologist or a reputable jeweler. They can perform tests such as the diamond specific gravity test, the diamond hardness test, and others that require specialized equipment.

Remember, while these tests can provide some indication of a diamond's authenticity, they are not foolproof. It's always best to purchase diamonds from reputable sources and to ask for a certificate of authenticity or a grading report from a recognized gemological laboratory.

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How to Tell if a Diamond is Real with WaterGet a glass and fill it with water. It doesn't matter what type of water you use.Drop the diamond into the glass of water. Due to the high density of a diamond, when dropped into water it will sink. If the diamond floats to the top or middle of the glass, it's fake.read more >>