Blacksmith's Whetstones can be obtained from slain enemies or purchased from some vendors. For example, Greust in the Forest Encampment and Hargan in The Sarn Encampment (Act 3) and (Act 8) will sell a Blacksmith's Whetstone in exchange for three Armourer's Scraps. Blacksmith's Whetstones may also be obtained from Artisan's Strongboxes.

One can sell any number of weapons whose total quality is at least 40% to any vendor in exchange for a Blacksmith's Whetstone. One can trade Hargan 8 Blacksmith's Whetstones in exchange for a Glassblower's Bauble. One can also sell a Blacksmith's Whetstone to any vendor for 4 Scrolls of Wisdom.