Emerald dust

Emerald dust is a crafting component in The Witcher 3: Wild Hunt. It can be dropped by some monsters or obtained by dismantling emeralds or jewelry like silver emerald rings. It is also used to craft the following items:
 * Lesser glyph of Axii
 * Oathbreaker armor
 * Ofieri gauntlets
 * Ofieri scale armor
 * Viper silver sword
 * Viper steel sword
 * Viper venomous steel sword

Emerald dust is sold by certain merchants:
 * 1 is sold by the alchemist at the crematory near Arette
 * 1 is sold by Tomira in White Orchard
 * 1 is sold by the merchant in the Putrid Grove
 * There is also a 50% chance that the merchant at Aeramas' Shop will have 1 emerald dust in stock