lunazhou|1460214814|4017276 said:
I am looking for a green diamond, still dont know how to choose the color, can anyone give me some suggestions?
Three ways to choose the color come to mind:
1. The color
you love.
2. The color
others love.
3. The color that gives you the most size for your budget.
I'm all about #1.
That means #3 goes out the window.
Hence my FCDs are tiny. (But I have groovy high-magnification macrophotography gear

)
#2 is not too important to me when shopping, though I do love to share pics of my babies.
Of course there's is nothing wrong with giving more weight (pardon the pun) to #2 and #3.
People just vary.
lunazhou|1460214814|4017276 said:
Which color is better? fancy grayish yellowish green and fancy deep grayish yellowish green? fancy deep diamond seems more expensive, but I feel fancy deep is a litter bit dark

how to choose?
Again, there is no 'better'.
I suspect you're asking which color is more highly-valued by the market.
Sorry, I don't know which.
Here are some reasons I've given up trying to analyze FCD prices.
There are so many hues and combination of hues (primary, secondary, and tertiary), nine tone/saturation levels, stingy old nature giving us very few examples of each for comparison the vast majority of which are not for sale with published prices.
Clearly there are a few broad FCD pricing rules.
Price descends from Red to Brown, but I've noticed the
precise order of the hues varies.
The price peaks at the tone/saturation grade of Vivid.
Those are easy black and white rules, but as your questions get more detailed the answers become more ... "Well, it depends."
A few people
can answer your question,
"Which color is better? fancy grayish yellowish green and fancy deep grayish yellowish green? "
I'm sure the folks who run
www.leibish.com know.
But an FCD vendor detailing on the Internet what's less desirable might make those FCDs harder to sell, aka drop their value.
Understandably diamond vendors want to sell
every diamond in their safes.
[Keep this in mind when diamond vendors post here. While most are ethical, I know of one whose posts here are often polluted with self-interest.]