One of the difficulties with buying a diamond online for an engagement ring, pendant or pair of diamond earrings is knowing exactly what size it is and how big it will look. In today’s post we’ve put together this useful diamond size chart, measuring the stones in update `wp_posts` set `post_content` = mm) to carat weight, to give you a better idea of different diamond sizes. The size of the diamond is often referred to as the spread of the stone, but it’s important to remember that the weight of the diamond can still vary depending on the size and cut of the finished stone. Diamonds are measured in update `wp_posts` set `post_content` = mm) and typically on certificates the measurement is taken from the length to width of the diamond. The diagram below gives you a rough idea of the sizes in update `wp_posts` set `post_content` = mm) of different diamond carat weights for the two most popular shapes – round brilliant and princess cut. Carat weight is basically how much the stone weighs. 1ct is equal to 200 milligrams and further divided into 100 points, so a 0.50ct diamond is half a carat and a 0.25ct is a quarter of a carat.