The diamond weighs 40/100ths of a carat. Other measurements depend on the style of its cut.
A carat diamonds size is 3.5mm.
A two carat round brilliant cut stone will measure about 8.2 mm. A different cut will have a different measurement.
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.
Carat is a weight measurement for a diamond: here size matters -- bigger is better, biggest is best.
These gemstones weigh the same: one carat.
One carat equals 100 in this example. If the diamonds are of equal size, then each diamond weighs 4.5454545 carats.
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.
A diamond of this size is unknown, and therefore, not something that can be valued.
The total carat weight of Ebel women's diamond watch is 0.50.
An estimate for a diamond with this measured cut may be about three carats.
This rare stone may be available at an auction, but it is unusual enough that there are probably very few stones that meet this description. One commercially available yellow stone for sale today on Blue diamond -- the largest yellow -- is a 7.37-Carat Fancy Light Yellow Radiant-Cut Diamond priced at $84,966. (Jackie Onassis was given a 40-carat diamond when she became engaged to Onassis. It was auctioned in 1996 for US$2,500,000. A yellow diamond of this size would certainly cost perhaps millions more.)
Carat for carat, we usually see a diamond costing more than an emerald. That's a generalization, but it quite accurate. Carats (carat weight or size), cut, color and clarity are the variables that determine price.