- Istanbul Jewelry Show, which is among the five largest jewelry fairs in the world, will be organized at Istanbul Expo Center between 16-19 March 2023. As Erba Makina family, we proudly present to you our vibratory surface treatment machines, which are specially produced to provide perfect surface treatment in the jewelery industry. We bring you our TURBO, EVP-R and EVT Series machines, which you can process even the thinnest jewelry pieces with maximum quality and minimum time.