One of the features I love about color in tourmaline is how different a color such as yellow green can look/feel in different gemstones. I think there are at least three different sets of conditions that can produce a yellow to green stone in Elbaite, the most common species of tourmaline in gemstones. They are; an iron chromophore in the richer greens on the yellow side, manganese titanium with low iron chromophore, for yellower greens and a color center induced by radiation for pure yellows. The chromophores deal with trace elements in the tourmalines and the color center deals with the rearrangement of elements in the tourmaline.
This brilliant emerald cut, that is a fine example of eye candy, looks like it came from a different world than the pure yellow to yellow with a touch of green that are rather toned down pastels. And I bet they are. The complexities of tourmaline color, along with difficulties in analyzing tourmaline still leaves many origins of color in tourmaline unanswered.
Back to the posted gemstone. It is eye clean and has fine crystal, which makes a fine setting for yellower ends and slightly green sides in this emerald cut. The different dichroic colors don’t fight each other, but blend into a blazer. The gemstone weighs 2.67 carats.