This person is called a gemologist. There may be a sub-definition of this job title particular to one who selects diamonds all day, but overall, this person trained and is probably certified as a gemologist.
Read more, below.
Have diamonds checked by a jeweler. It takes an expert to be sure
Essentially, diamonds are rocks. They are also called ice.
Only 25% of diamonds mined are gem quality: the remaining 75% are industrial diamonds, which is another term you could use for low quality diamonds.
Some diamonds are found in rivers and in the mouths of rivers as they flow into the ocean. Water flowing over the tops of the volcanic pipes -- which push the stones to the earth's surface -- deposits the diamonds where they can be found in flowing water.These diamonds are called alluvial diamonds.
Probably jewelery.
Have diamonds checked by a jeweler. It takes an expert to be sure
Diamonds made in factories are called man-made diamonds.
Essentially, diamonds are rocks. They are also called ice.
Loose diamonds are called loose diamonds. When set as a group, the term may describe the setting more than the stones, i.e., pave, which is a 'pavement' of diamond stones. Otherwise multiple diamonds are simply called diamonds.
A bully expert is called a bullnation
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An Expert Aviator is called an "Ace".
A cultures expert is called an ethnologist.
Coal has been called 'black diamonds'. This is probably because coal and diamonds are both formed from carbon.
They are called blood diamonds because the money made from them is used to fund wars and terrorist activities.
Diamonds are VALUABLE
What does this expert tell you about the setting of this selection?