the invention provides a process of producing rubusoside from steviol glycosides of stevia rebaudiana plant . the process is useful for producing high purity rubusoside with purity greater than 95 % . high purity rubusoside is useful as in combination with other caloric and non - caloric sweeteners as well as non - caloric sweetener in various food and beverage compositions . the high purity rubusoside is useful as non - caloric sweetener in edible and chewable compositions such as any beverages , confectionaries , bakeries , cookies , chewing gums , and alike .