How Many Mm Is 4 Carats: Precise Measurements Unveiled

Have you ever wondered about the dimensions of a 4-carat diamond? When a diamond reaches 4 carats, it typically weighs around 800 milligrams (0.8 grams). In terms of size, a 4-carat round diamond boasts a diameter of approximately 10.1mm. To put that into perspective, this translates to roughly 0.4 inches across its surface. So, if you’re curious about how big a 4-carat diamond is, envision a sparkling gemstone with a diameter equivalent to approximately 0.4 inches.

To better understand the relationship between the size of a round-cut gemstone and its carat weight, let’s look at a table of measurements. When a round gemstone has a diameter of 4mm, it typically weighs approximately 0.25 carats. This information provides a reference point for various sizes, such as a 4.5mm gemstone weighing around 0.36 carats, a 5mm gemstone at approximately 0.5 carats, and a 5.5mm gemstone weighing about 0.66 carats. This table helps clarify the carat weight associated with different round gemstone sizes. The information was last updated on August 23, 2021.

Diamond Size Chart

Round MM Size	Round Carat Weight
9.1 mm.	3.00 ct.
9.75 mm.	3.50 ct.
10.25 mm.	4.00 ct.
10.75 mm.	4.50 ct.

Round MM Size	Round Carat Weight
4mm	0.25 ct.
4.5mm	0.36 ct.
5mm	0.5 ct.
5.5mm	0.66 ct.