Your answer depends on your perspective. Per se, diamonds can't be assigned a judgment: the person judging the diamond must assign the attribute.
If you can't afford the diamond you want to buy, this may be a disadvantage. If you wear your diamond and it is the focus of an assault or robbery, this may be a disadvantage. Because gem-quality diamonds are small, if you lose one and can't find it, this may be a disadvantage.
No. Diamonds are formed from carbon.
Mined diamonds are superior to any man made diamonds.
There are no diamonds mined in any European country.
yes many have disadvantages
You can purchase diamonds in most any city in the world. There is no 'city' where diamonds are mined, however.
Diamonds are found in diamond mines in Africa, unless you're shopping for diamonds. If the later, you can visit any jewelery story in any city in Africa that sells diamonds and find them there.
No. Diamonds are gemstones; jewelery can be any accessory adornment.
Yes, diamonds are a form of carbon.
Diamonds can be cut into almost any shape.
Because diamonds are harder than any metal.
The price or value of diamonds is not controlled by any government on earth. The price of diamonds is controlled by markets.
Of course because they are made of real material; they are just not diamonds. They are less valuable than diamonds.