Thank you for submitting your item for appraisal. This appears to be what you suggested, a set of three chinese lucky gods or 三星 sanxing, wishing you happiness, prosperity and longevity. Such sets are very common and very popular. They can be found in nearly every chinese household. The set in your possession was made in the mid 20th century in Jingdezhen, similar can be found offered at auction frequently. The estimate is based on similar offered or sold. There is no measurement for the sentimental value you might attach to the item.