We all love how a diamond shines in the sunlight. Test your stone by putting it in direct sunlight and examining the colors it reflects. A real diamond will reflect both rainbow colors as well as white light. If you only get one of the two, then the diamond isn't real.
In most cases, diamonds fluoresce blue. This cancels out the slightly yellowish color in most diamonds, resulting in a whiter appearance in sunlight. In artificial light, there's little UV intensity more than a few inches from the light source.
A real diamond appears gray and white inside (brilliance) when held to the light and can reflect rainbow colors (fire) onto other surfaces. A fake diamond will display rainbow colors within the stone when held up to light.
When you place a real diamond underneath an ultraviolet light, the stone with fluorescence in it will turn blue. But it's important to know that this will only happen with about one-third of all diamonds. A fake diamond, on the other hand, will almost never look blue under a black or UV light.
Fake diamonds do not reflect spectral rays from the beam of the flashlight. This is because a diamond's refractive index is high; it makes the white light entering the diamond split into multiple colors before it exits on the other side of the stone.
Do all diamonds fluoresce? No. Only about 25% to 35% of diamonds exhibit some degree of fluorescence in reaction to long-wave UV light.
If you're holding a genuine diamond, you'll witness an intense blue color on the diamond surface. A fake gemstone will reveal itself through other colors — including green, yellow, or gray tints. The validity of this test is limited, though.
Purchase a cheap piece of corundum or buy a mineral testing kit that includes corundum. Hold the corundum firmly against a table and scrape the suspected diamond against the corundum. If it creates a visible scratch, the crystal is a diamond. If it doesn't create a scratch, then it is a different mineral.
The first step is to check for any inclusion on the stone with your bare eyes. If you're unable to see any inclusions with your bare eyes, then use a magnifying glass of at least 10X magnification to find out if the gemstone contains any inclusions. If you found any, then they are real gemstones.
Hold it in the light to see how it sparkles.
A fake diamond will have rainbow colors that you can see inside the diamond. “People have a misconception that diamonds sparkle like a rainbow, but they don't,” Hirsch said. “They do sparkle, but it's more of a gray color.
Diamonds are dense and will sink quickly, while certain imitations will sink more slowly. If your gem doesn't immediately sink to the bottom, it's likely a glass or quartz imitation.
As the hardest gemstone known to man, diamonds are also extremely dense. This makes them durable and great for everyday wear but also makes them heavy. Because of their weight and density, diamonds sink when they're dropped into a glass of water.
As straightforward as it sounds, fill a glass of water at home to roughly three-quarters full. Separate the stone so that it is loose, and drop it into the water. Diamonds are highly dense and a genuine gem will sink to the bottom – every time. If it hovers to the surface or only partially sinks, then it is a replica.
Diamond Fluorescence In Direct Sunlight
Ambient sunlight, such as the light that passes through windows into buildings, will not alter the diamond color. Therefore, while a diamond's fluorescence may lower the value of a stone, it will still appear gorgeous with great sparkle in nearly every situation.
When light enters an ideally-cut diamond, the light bounces around its internal facets, bends, and exits through the top of the diamond. This is known as refraction. Refraction creates a sparkle in a diamond as a result of light bouncing around the inside, which hits your eye when the stone is in motion.
On the other hand, raw diamonds are uncut and unpolished. In other words, they have not been altered or tampered with after they were discovered. Raw diamonds look like transparent stones with yellowish or brownish tints. There are some that are colorless but these are rare.
When a diamond is mined, nature has already determined color, clarity, and most of carat weight. But a rough diamond just looks like a transparent rock. It doesn't sparkle. It doesn't flash in rainbows.
Natural crystals of quartz and diamond form very different crystal shapes. Quartz forms six-sided, elongated crystals that normally only have one terminating end. Diamonds form eight-sided crystals with approximately equal lengths and widths.
To determine if your diamond is real, hold a magnifying glass up and look at the diamond through the glass. Look for imperfections within the stone. If you're unable to find any, then the diamond is most likely fake. the majority of real diamonds have imperfections referred to as inclusions.
Natural diamonds have a property known as fluorescence. This phenomenon enables diamonds to produce glows of varied colors when exposed to black light (also known as ultraviolet light). A pure and natural diamond is known to produce a blue glow when exposed to black light.
Visit A Trusted Jeweler
Many jewelers will appraise your stone free of charge and experts will often be able to tell immediately if your diamond is authentic or not. If your stone came with a certificate, your jeweler should be happy to take a look at it and tell you whether it is from a trustworthy source.
Some diamonds fluoresce under UV light. Reviewing your diamond certificate, fluorescence will typically appear with a description such as nil, very slight, slight, medium, or strong. Diamonds graded with strong fluorescence may exhibit a milky appearance, especially in strong sunlight.
Ultraviolet Light: About 30% of diamonds will glow blue under ultraviolet lights such as black light. Fake diamonds, on the other hand, will glow other colors or not at all.
Usually fluorescence is blue in color. Less often, a diamond can have yellow or even white fluorescence (other colors too). Diamonds with Strong - or Very Strong - fluorescence can appear quite cloudy, milky or hazy to the naked eye, and emit a prominent and saturated glow in the presence of UV light.