Do real diamonds have a rainbow color?

4. Hold it in the light to see how it sparkles. The way that diamonds reflect light is unique: Inside the stone, the diamond will sparkle gray and white (known as “brilliance”) while outside of the gem, it will reflect rainbow colors onto other surfaces (this dispersed light is known as “fire”).Jan 16, 2015 read more

Any other color reflected, such as a rainbow, suggests the diamond is of poor quality or, even worse, a fake. Genuine diamonds reflect from all sides of the diamond, while fake diamonds do not. read more

If you have a UV or Black light to hand then you might want to try this simple test. Place the diamond under the light in a dark room. If the diamond is real it should show a blue fluorescent glow. The absence of blue, however, does not mean it is fake, it could simply be a higher quality diamond. read more