A 4mm diamond measures 4mm in at least one measurement.
If the stone is a round brilliant cut, it could weigh about one quarter of a carat. However, only a certified gemologist can give you the true weight of the stone, and certify it for you.
Size of diamond is available in different measurements: its mm size across the girdle diagonally, and its carat weight. You can look at the chart below, and depending on the cut, you may be able to estimate the different sizes for your diamond. NB: "Each diamond has its own measurements. Each diamond will differ from the standard millimeter dimension!"
The size of the stone used in a 2ct princess cut diamond engagement ring is 8.2mm. This size is measured using a pair of brass calipers. The size can vary, depending on how deep the diamond is, but as a guide 8.2mm is a fair estimate.
If the diamond is an ideal emerald cut with these measurements, the diamond may weigh about one quarter of a carat. Otherwise, you have stated the diamond's 'big' size in measurements.
The raw Cullinan Diamond remains the largest raw diamond ever found. It was found in South Africa in 1905 and weighed over 3,000 carats. It filled the palm of a grown man's hand. The original size of the Hope Diamond is unknown, but today it is about the size of a egg, considerably less than the Cullinan.
A round cut diamond weighing .25 carats measures 4.1mm at the girdle.
2.3mm in size
A round cut diamond weighing .25 carats measures 4.1mm at the girdle.
4mm x 16mm ST
4mm is about 0.157480315 inches, *64 is just over 10, so 10/64 (5/32) is the closest fractional size.
4mm its in the question
4mm is 0.15748032 of an inch.
As wide as 4mm on a ruler
A 4 mm drill bit is equivalent to 5/32 inch.
4mm is smaller than 5mm
4mm-6mm in inches = -2
25mm - 4mm thick150mm -4mm thick50mm - 4mm thick