In digital photography "color" depends of so many factors, that majority of people doesn’t even aware and care about. Correct white balance, right color temperature, available light, you name it. When you look at the picture, you never know is this real color or just the color your camera can produce. Two posts above is the real example of it. To show exact color of your stone you have to use some tools which can give you at least 99% accuracy. Color checker is one of them.
X-Rite: Get exactly the color you need, every time, anywhere in the world.
