the scale of a 1.5-carat diamond can range primarily based on its reduce, shape, and different elements. Carat is a unit of weight, now not size, so the scale of a diamond can differ even supposing they've the same carat weight. however, as a wellknown guiding principle, a spherical fantastic-reduce diamond with a 1.5-carat weight would possibly have a diameter of round 7.4 to 7.5 millimeters. keep in mind that other shapes (along with princess, emerald, oval, and so forth.) could have extraordinary dimensions for the same carat weight. additionally, the cut fine can influence how massive or small a diamond appears when regarded from the pinnacle.