Yes, diamonds found in America are natural stones.
Your answer depends on what property interests you: clarity or carat weight, or whether or not your 'big natural...stone' is a diamond. A local jeweler can help you understand the stone that you take in to be tested.
A genuine diamond is a natural stone that has been mined, graded, cut and polished, which results in its becoming a gemstone.
One answer could be the inexperience of the diamond viewer. Another is that many diamonds are no bigger than a grain of rice, also their color can be missed against the natural color of the ground. The field test for diamond is 'extreme hardness'. As well only about 25% of natural diamonds are of gem-stone quality, so the other 75% of diamonds found will not appear to possess a natural clarity or colour commonly associated with gem-stone quality rocks.
A natural diamond is one that is mined from the earth. One that is grown in a laboratory would not be a natural diamond.
A natural diamond is more rare than a manufactured diamond.
Your answer depends on what property interests you: clarity or carat weight, or whether or not your 'big natural...stone' is a diamond. A local jeweler can help you understand the stone that you take in to be tested.
No. Diamond is the hardest natural mineral on earth.
Yes, you can buy one, or inherit one. Note that a gemologist can confirm that the diamond is a natural yellow and not an enhanced stone.
The chemical boron is available with the carbon when the diamond forms, rendering the stone blue.
A diamond can be either, depending on the natural colour of the stone.
A cultured diamond is made in a laboratory and is not a natural stone, even though it is manufactured from carbon. Industrial diamonds have been made in laboratories in America since the 1950s, and gem-stone quality diamonds only recently. What can be inferred from the phrase in your question is a description of a gem-stone quality diamond (which is always less valuable than a natural diamond).
Synthetic diamonds are man made and natural diamonds are mined from the earth. Synthetic is not rare like natural. Synthetic will typically have the same color, cut, and other quality attributes and a natural stone will vary from stone to stone. Each natural stone is like a snowflake. No two are alike.
A genuine diamond is a natural stone that has been mined, graded, cut and polished, which results in its becoming a gemstone.
in Pokemon : pearl in real life : quartz
As a rough stone, there is no fixed price for a diamond, because its clarity, its colour, and its cut are not determined. Take your rough stone to a diamond cutter who can plan a cut for the stone. Once planned -- the cutter will plan a cut to highlight the rough stone's natural colour and clarity -- so that you can have your cut diamond valued. The diamond cutter may purchase the stone from you outright, or make an agreement with you to be paid from the sale of the finished stone.
Take the stone to a certified gemologist, who will be able to tell you the origin of the diamond. To the amateur, a yellow diamond just looks like a yellow diamond.
A jeweler can help you determine whether or not your diamond is real, using a probe. Adding the word American as a modifier to the noun diamond, gives zero indication as to the authenticity of the stone in question.