A round cut diamond weighing .25 carats measures 4.1mm at the girdle.
A round cut diamond weighing .25 carats measures 4.1mm at the girdle.
A 4mm diamond measures 4mm in at least one measurement.
Small and round.
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.
4mm is 0.15748032 of an inch.
Exactly 0,4
4mm
There are 25.4mm to one (1) inch, so there would be approximately six (6) 4mm beads per inch. If buying a 16" hank of 4mm bicone beads, you would be buying approximately 100 4mm beads.
Your answer depends on the type of stone and the cut. The measurements you give are approximate to a sort-of princess cut, but the measurements you give are not 'true' for the ratios defined by the cut. Your local jeweler or certified gemologist can weigh the stone for you and give you its carat weight and type.
4mm its in the question
As wide as 4mm on a ruler
4 mm = 0.4 cm