Based on a market research, 1 full carat is the average preferred size around the world, including Singapore. Currently, all our rings are made with 1 carat. We also offer half carat sizes such as 0.5 and 1.5 carats. For bigger carat sizes, we offer up to 4 carat size (10mm). For a custom carat order, you may drop us an email at sales@princessgem.com