"Good" is a judgement and you are the judge.
Yes, a 10 carat diamond is 'good'.
The carat defines the standard unit of weight measurement of a diamond.
Carat is the measurement of a diamond's weight. The stone's value would partially depend on its carat weight.
A one carat diamond weighs one carat and contains one carat.
A two-carat diamond is a gemstone that weighs two carats.
A 625 carat diamond would be a very large diamond, weighing 625 carats.
A half carat diamond of this cut measures 5.2 mm at the girdle; a .65 carat diamond measures 5.6 mm at the girdle. A certified gemologist can give you the exact carat weight of your diamond.
Carat is the weight measurement for gemstones.
A one carat diamond weighs one carat, or .20 grammes.
One carat of diamond in carat total weight equals one carat. One thousand dollars worth of diamond in total carat weight depends on the cut, colour, clarity and individual carat weight of the stones in the group.
Good is a value judgement and you are the judge. The carat weight you question is small.
Any diamond is 'good' when it can be certified as to its characteristics: cut, colour, carat weight and clarity. A certified gemologist can perform this work for you.