That speed difference bends light into rainbows of color and flashes of brilliance.ĭiamonds sparkle differently in sunlight versus candlelight or daylight versus office lights because they reflect the environment around them. That’s more than 100,000 miles per second slower than in air. When a beam of light hits a diamond, it slows down to just 77,000 miles per second. Scintillation changes as the diamond moves: it’s the sparkle of the diamond.Ĭut unleashes the potential of diamond sparkle. Scintillation is the spots of light that flash as the diamond moves and the pattern and contrast of bright and dark areas in a diamond. In bright sunlight a diamond will reflect rainbows around you like a prism. That’s why a poorly cut diamond looks like glass.Ī beautifully cut sparkling diamond shows three special optical effects brilliance, fire and scintillation.īrilliance describes diamond brightness, the reflections of white light that make diamonds look like they are lit from within.įire describes the rainbow flashes of diamond dispersion: light bent into spectral colors. Either gives you dark spots in your diamond. Too deep and it leaks through the side instead of hitting your eye with sparkle. Too shallow and the light just passes through. The cutter makes that happen by getting the angles just right. Diamond facets are like a hall of mirrors that reflect light from all angles and send it back to your eyes. The angles, proportions, and alignment of the facets direct the light inside the diamond and create brilliance. To create the sparkle of the round brilliant diamond, diamond cutters add 58 precisely polished facets to capture light. The cutter uses a wheel covered in diamond dust to slowly grind and polish each facet. But after that, diamond cutting takes as much patience as ever. Today, the diamond cutting process often starts with lasers to cut the rough into chunks instead of the traditional saw. When modern diamond cutting was invented, man unleashed the brilliance that comes from diamond’s unique optical characteristics. It took thousands of years for our ancestors to learn how to use diamond to polish diamond. And this doesn’t just happen, it’s the result of the skilled craftsmanship of the diamond cutter. It doesn’t dance with light.Ĭut is what makes a diamond perform in the spotlight. But a rough diamond just looks like a transparent rock. When a diamond is mined, nature has already determined color, clarity, and most of carat weight. That’s what makes diamond the king of bling. But what really makes a diamond special is the way it handles light. Diamonds are the most sought after gems on earth. Laser Drilled Diamonds (and Why You Should Avoid Them).What Are the Ideal Diamond Proportions?.Why You Need a GIA Grading Report for Your Diamond. ![]() ![]() What You Need To Know About Buying Black Diamonds.What is the Difference between Diamonds and Diamond Simulants?.Understanding Diamond Fluorescence and Value.Understanding Diamond Carats and Diamond Size.Understanding Diamond Clarity and Value.
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