Topaz
Topaz is a resource in Eiyuden Chronicle: Rising. It is found in the Quarry, but can also be crafted at the Trading Post, and is received for completing the Shop Quest Fetch me Some Fertilizer, and the Resident Quest Yash's Gold Rush Part 2.
Topaz is necessary to upgrade weapons and can also be used to craft a Level 4 Vitality Ring.
Locations
Quarry
One Topaz can be found near the Golem's Keep signpost in the Quarry. From here, head west and use the wooden ledges to reach higher ground. Instead of traveling to the very top, there will be a series of wooden ledges on the right that will guide you to the next room. There, you will find Gold Ore and Topaz.
Another Topaz can be found in a blue chest in the far upper right screen. This is to the far right part of the platforming puzzle, near the red lever.