You've obviously tried with no luck, so chances are it's discontinued. However, we need more info to identify it. All we know is it's 18x18, the color is Rosso and the company calls it CA74. That means nothing to anyone.
You need to figure out who made it, so you'll have a brand ID. When did you buy it?
TILE GUY - retired- TROY, MI - Method & Product suitability consulting.