April Birthstone: History and Meaning of The Cubic Zirconia Birthstones Cubic Zirconia Birthstones is one of the cheapest alternatives for Diamonds. Diamond is one of the costliest pieces of jewelry which is not affordable for everyone. So that's why Cubic Zirconia which looks similar to Diamond is one of the best alternatives for Diamonds. Cubic Zirconia has a completely different chemical composition than Diamond and also has dissimilar dispersion properties but due to good similar appearance, it turns out to be a good option. It is generally 5-6 Carat and that's why it is very cheap and affordable. As gemstone jewelry, it has always got huge demand in the market. Cubic Zirconia satisfies a huge part of society and completes their wish of wearing shining Gemstone Jewelry.