A diamond is valued by its cut, clarity, carat weight and color. A local jeweler can show you diamond stones and give you a precise price for each one.
Generally, people do not "invest" in diamonds. Diamonds are valuable in terms of profit if they can be sold for more than than the seller paid. But the price does not go "up or down;" there is no speculating.
The price of diamonds from Hearts of Fire ranges from 1,000 to 100,000 dollars. The price of the products depends on the size and the used material and diamonds.
The price or value of diamonds is not controlled by any government on earth. The price of diamonds is controlled by markets.
All diamonds are formed from carbon, regardless of the price.
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Forty crates is a large quantity of diamonds. The price would depend on the size of the crates and the quality of the diamonds in the crates.
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Althoguh clarity or color enhanced diamonds are "safe" to buy, they should be dramatically discounted from the price of natural diamonds.
Many factors determine price. In this case determining factors may be at least rarity and need. Every human needs water and 70% of our planet is covered with it. Diamonds are exceedingly rare, especially gem-quality diamonds, which represent only 20% of all diamonds mined. No human 'needs' a diamond.
The average price of Russia's exported diamonds makes up $22 per carat you will get less selling in the country since they mine them there.