The rising demand for natural dyes creates opportunities for farmers and artisans, boosting employment and local economies. This research investigates the utilization of a natural colourant derived from Basella alba fruit, commonly recognized as Sri Lankan green spinach, for dyeing silk fabrics without mordants. The methodology involved an aqueous extraction, acidic, and alkaline extraction process of natural dyes. Additionally, in this extraction process, a solution comprising Basella alba fruit extraction and Soy Milk Solution was mixed in ratio 4:1 enriching the dyeing affinity of the natural colourants. Basella alba was chosen as the primary colourant, with investigations conducted on the influence of varying pH levels and extraction temperatures. The results of this study suggest that Basella alba fruit extract can be used as a natural dye for silk fabric dyeing. CIE La*b* and K/S data have revealed excellent reflectance on Silk fabric. The extraction process of Basella alba fruit for natural dyeing showcases the potential to yield natural pastel shades, such as yellow, pink, and purple shades. The dyed samples were assessed for their light and washing fastness, receiving grades ranging from fair to excellent. Notably, the washing fastness 4:1 ratio of Basella alba fruit with Soy Milk Solution with extract dyeing yielded particularly impressive results. It reveals enhanced washing fastness properties particularly in low-temperature (40°C) dyeing processes. This study not only highlights the technical viability of employing Basella alba fruit extract for silk fabric dyeing but also highlights its socioeconomic significance in fostering sustainable livelihoods and niche market.