Precious stones

In The Witcher, there are several kinds of "gems", or precious stones. Most can be used as gifts or in exchange for goods or services:

Image	Name	Locations and uses	Buy	Sell
	Amber	Wardrobe at the Reverend's house in the outskirts. Sometimes also upstairs at the house across the street from the Reverend's. Sometimes in the trunk next to Triss' bed. Sometimes on Dagon's body after the duel in Chapter IV. The druids in the cave in the swamp cemetery will exchange this gem for potions.	40	20
	Diamond	You can win a diamond from Zoltan in your first drinking contest with him. The gossip in Chapter II will accept either red gloves or a diamond for a sexual encounter. In a trunk from the Lionhead Spider Cultists' lair. There is also a quest diamond (Gramps' diamond) in Chapter IV, but it can not be sold and looks entirely different. The clerk at the town hall takes diamonds as gifts in return for sexual favours. The druids in the cave in the swamp cemetery will exchange this gem for potions.	120	60
	Ruby	Salamandra often carry rubies. The druids in the cave in the swamp cemetery will exchange this gem for potions.	80	40
	Sapphire	On Savolla's body in the Prologue. In the "goal" trunk in the crypt in the sewers in Chapter II. Wardrobe, 2nd floor, non-human barracks in Temple Quarter during Chapter III. In the "goal" trunk in the Bandits' hideout (fisstech lab) in the sewers. Blue Eyes takes sapphires as payment. The druids in the cave in the swamp cemetery will exchange this gem for potions.	60	30
	Emerald	not found in the game	–	–

Notes

• The teleportation crystal which Kalkstein gives Geralt in Chapter II is also labelled as a gem, but it can neither be bought nor sold as it is a quest item.
• The swordsmith off the Trade Quarter marketplace will require a gem before he reforges a sword. There seems to be no benefit from doing this, though.