How much troilite is in 1 carat of diamond?

Answer 1

As introduction, from Wikipedia:

"Pyrrhotite is an unusual iron sulfide mineral with a variable iron content: Fe(1-x)S (x = 0 to 0.2). The FeS endmember is known as troilite."

Troilite is most common in meteors that originate on the moon or on Mars, and it is found in trace amounts on earth. Some meteorites have been found that contain diamond material. Most common of these is known as black diamond, or carbonado. But carbonado does not classically contain any troilite.

In sum, a one-carat diamond with any trace of troilte would be hard to find within any gemstone marketplace, but you may have luck when trying to purchase a meteorite.

Answer 2

On average, diamonds contain less than 0.1% troilite. Therefore, in 1 carat of diamond, there would be an extremely small amount of troilite present. Troilite is a rare mineral inclusion that is often found in diamonds created in environments with sulfur-rich fluids.