old_expat - 3:43 am on Oct 30, 2006 (gmt 0)

If you want to get addional perspectives on "color", start looking at saturation / chroma and tone.

Some gemologists claim there is no such hue as "pink" i.e pink sapphire .. that it is actually a low saturation of red.

If you believe pink is a hue, find it on the color wheel or find its wavelength.;)

Then try to find brown .. = red with a dark tone.

One of the instructors at AIGS in Bangkok told of a green tourmaline collection with 50,000 identifiably different stones.

Okay, now go ahead and calibrate your monitor.:)