Yellow diamonds are sometimes called canary diamonds. A significantly large yellow diamond is owned by Tiffany and Company, and is named The Tiffany Diamond.
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Yellow diamonds, also known as canary diamonds come in all shapes, sizes and colors with the intense yellow and vivid yellow being the most expensive colors. They are quite rare and just as expensive and usually have a very high grade issued by GIA. Black diamonds that are available in the market are usually low grade white diamonds that have been colored black, however, natural black diamonds can be expensive depending on the quality.
Depending on what other initials are being used to describe the stone, it's possible that FY means fancy yellow -- the highest quality of yellow colour in diamonds, and IF stands for internally flawless -- the highest clarity in diamonds.
Very small diamonds are sometimes called chips.
There are several brand names, but commonly, 'CZ' is a term used to describe fake diamonds.
Chartreuse has two main shades: one a yellowish green, the other a greenish yellow. Neon Green is also a yellowish green.