it is 1.67856mm
If 7.7 is the carat weight, then the size is 7.7 carats. The millimeter measurements of a diamond with this weight will vary, depending on the cut.
Your answer depends on the cut of the stone and what about the stone you are measuring.
The carat size of a diamond should be determined by a certified jeweler. There are two different sizes the is the millimeter size which as stated was 7mm and then a jeweler can give a carat size.
Millimeter is a size measurement; carat is a weight measurement. Take the stone to a local jeweler and ask for its weight.
Any diamond is worth whatever someone will pay you for it. Today, on Blue Nile, you can purchase a diamond of this approximate carat weight and pay between US$1,508 and US$4,981, depending on the cut, colour, clarity and exact carat weight that you want.
This millimeter measurement across the girdle of a round cut diamond may be equal to about 1.25 carats in weight. A certified gemologist can give you the exact weight of your diamond.
This number indicates that the diamond weighs 04/100s of a whole carat.
The weight of the diamond -- if it's a round cut diamond -- can be about 1.25 carats. The carat weight of the ring depends on the metal and that weight will be described in ounces, not carats. You can pay a certified gemologist to give you the exact weight of the diamond and its metal ring setting.
The value of anything is the amount someone will pay you for it. Today on Blue Nile, you can purchase a diamond of this approximate carat weight and pay between US$4,138 and US$33,844, depending on the clarity, colour and cut that you want. Best practices dictate that you pay a certified gemologist to document your diamond, which will help you establish a fair market value for it.
The carat defines the standard unit of weight measurement of a diamond.
A 625 carat diamond refers to a diamond that weighs 625 carats. Carat is a unit of measurement for gemstones, with one carat equal to 200 milligrams. A diamond of this size would be considered extremely rare and valuable.
Carat is the measurement of a diamond's weight. The stone's value would partially depend on its carat weight.