Peridot: Price discrepancy? Color Change Garnets: Value?

[RedSpinel]

I agree with LD's definition of colour change versus colour shift. When the change is dramatic and goes to another colour on the other side of the colour wheel, it is a colour change. So green to red and blue to red are colour changers. If the two colours are next to each other on the colour wheel, they are colour shifters. Meaning blue to purple and yellow to green are colour shifters.

Then there is also the slight shifting of stone colour under different lighting. I don't think there is a set name for it though. In this case, the shift is even less dramatic than a true colour shift stone. Usually it is like red to pink or blue to violet, sort of like a half step away to the next wheel colour.

I would of thought it wouldve been something like you mentioned above^^

I am very familiar with the color spectrum right now because I've been reading about lasers, laser color frequencies, and the frequencies that the human eye is most sensitive to, which is at about 550nm, or in other words, green. I bought 3 cheap lasers from Amazon in a "value pack" of of different color frequencies(405nm, 532nm, 650nm). One of them, the green one, which is 532nm, is actually the least powerful at around 30 milliwatts, whereas the violet(405nm) is 40mW, and the red(650nm) is almost 100mW, but even though the green laser is 1/3 the power of the red one, it's also MUCH brighter to the human eye!

On one side of the visible color spectrum is red and on the other end there's violet. Therefore violet and red are almost opposites. Someone mentioned a blue to violet color change, but blue and violet are very close on the color spectrum, violet is around 405nm, and blue at 450nm, which is close, green is around 532nm , orange-ish red is about 635nm, and red is at 650nm. So if a stone goes from two close colors like violet-blue(405nm - 450nm), then I figured that would be more of a shift, since those are close on the visible color spectrum.

But I could be wrong about that, and maybe it isnt about how close these colors are on the spectrum.