On August 9th, 2018, Miss Thailand World 2018 has set up a 'Runway Tutorial Session' for the 30 contestants at SIAMGEMS HERITAGE. 6 contestants were chosen to wear the exclusive and precious jewelry pieces from SIAMGEMS HERITAGE showcasing ruby, yellow sapphire, blue topaz and emerald with Mr. Dhwat Sommanobhat, Marketing Director of SIAMGEMS HERITAGE, and former Miss Thailand World winners - Cindy, Meya and Milk as judges.