The primary difference is in the ratio and composition of the silk fibre in the saree. Semi silk is a blend of silk and other fibers like polyester, cotton, or viscose, while pure silk is made from 100% natural silk fibers. You can have different varieties within the pure silk saree category itself. They vary in terms of percentage and quality of silk fibers used, and directly impact the price and quality of the saree.
A special mention for silk cotton saree sarees as they are most popular and highly preferred. These sarees are created by blending silk and cotton fibers, resulting in a fabric that offers the best attributes of both materials. The blend can range from 50-50 to a higher percentage of either fiber, affecting the texture and appearance. A pure silk cotton saree is made from natural silk and cotton fibres and more expensive. Regular silk cotton sarees blend silk often mixed with synthetic fibers and cotton, providing a similar look to pure silk cotton and are more affordable.
In general, any pure silk saree offers greater luxury, quality, and natural beauty, and comes at a higher cost. A semi silk saree on the other hand, provides a more affordable and practical alternative with a similar appearance to pure silk but not the same level of grandness. The choice between the two depends on individual preferences, budget, and intended use.