Depending on the context, 1ct tw could mean one carat total weight, and 1ct TDW could mean one carat total diamond weight.Without a context, it's difficult to give you a better answer.
200mg
Its depend on size, shape and colors normally the price of gemstone is $20-500 for more details you can try this Cabochonsforsale.
Before you sell a diamond, you are best advised to have it appraised, preferably by a certified gemologist. Then you will have a better understanding of the value of the stone you're trying to sell. You can sell it privately, on consignment, to a pawn broker, or to a jeweler who will buy it.
A one carat diamond weighs one carat, or .20 grammes.
1ct
Where ever you are in the world, a one carat diamond weighs one carat, or .20 grammes.
If you think to carat this has 200 mg and is not a SI unit.The volume depends on the density of the material (V=G/d).
It's a ring with a 1.5 carat diamond, the numbers indicate size. 1ct is already a very large diamond for a ring.
Well....Modern: Diamond.Mystical: Opal.Traditional: Diamond, Sapphire.So if you go with diamond, quite a lot.The Opal is worth a little.The Sapphire is worth the middle.
The initials CT are often used to represent carat in a context referring to the weight of a diamond stone. For example, 1ct diamond means that the diamond stone weighs one carat.
Industrial raw diamonds are much less expensive that gem-quality raw diamonds. You can visit the site, below, and look for the raw diamond that you want to buy.