Merchanting on Runescape takes several key factors, knowledge and experience, and though while both may come hand in hand occasionally there are some things that you just need to be told. Finding good merchanting items to use on Runescape isn't easy, but there are usually a few key things that you must look for.
Description: Wizards of the dark arts have freed the ancient demon Delrith. Find out how to imprison him again before its too late and he destroys Varrock.
Difficulty: Novice
Length: Medium
Requirements: Able to defeat an apocalyptic demon (Lvl 27, weakened with Silverlight Sword acquired during the quest)
Items Needed: 25 regular bones, 1 coin.
Quest Points Reward: 3
Reward: You can keep Silverlight, which is useful for weakening any kind of demon.
Start Point: Varrock Square
To Start: The Gypsy in her tent on Varrock square
1.Speak with Gypsy Aris. She will tell you about an ancient demon, Delrith, who was defeated long ago, by a a hero named Wally, who wielded the Silverlight sword. She tells you that the demon is returning, and is going to attempt to destroy Varrock. She prophesies that you are the one that can defeat the demon, and save the city.
She also tells you the incantation that Wally used to defeat the demon. Make sure to write this down, as the incantation is different for each person.
Note: This will not be your incantation. This is an example of one.
2.To get Silverlight, The Gypsy tells you to go and speak with Sir Prysin, in Varrock Castle.
3.Sir Prysin is on the first floor of the castle, near the entrance. Speak with him.
4.He will tell you that his grandfather was Wally, and the Sir Prysin has the sword in his possession. However, there are three keys needed to unlock the case in which the sword is held. One key is with Captain Rovin, one with Wizard Traiborn, and another, Sir Prysin accidentally dropped down the drain.
5.Walk to the northwest end of the castle, and climb to the third floor, Rovin's Chamber. Speak with Rovin about the key. After a conversation, he will agree to give the key to you.
6.Go back to the first floor, and head to the northeast side of the building. Climb up the stairs, and pick up a bucket.
7.Go back down stairs, and fill the bucket up with water, at the sink. Then, go outside, and use the bucket of water with the drain. The key will fall down into the sewers.
8.Walk out of the east castle walls, and climb down into the manhole (if the manhole is closed, simply open the lid).
Walk towards the back, and pick up the key from the ground.
9.Take your 25 bones, and head to the Wizards Tower, south of Draynor Village. Take them to the second floor, and speak with Traiborn. He will request 25 bones to preform a ritual so that he can get the key from his safekeeping.
The Grand Exchange has buying limits that restrict how much you can buy any item in the game, for most expensive weapons and armor this is around ten items per four hours, but it can vary depending on what the item is. You need to be merchanting an item which you can invest a serious amount of gold in within that 4 hour slot. Ten Dharok's armour sets for example would be a good choice, they cost around 10 million gp and so you can invest 100 million gold in just 4 hours. If you were looking at an item such as a dragon scimitar, it's only worth 100k so in 4 hours you could only put in a million gold.
You can generally expect returns of around 5-10% and so making 50k-100k on the dragon scimitar is clearly a pretty poor investment. On the other hand if your good merchanting items are worth a high value you can expect a good return - for example you'd make 5-10million runescape gold on those Dharok's sets. You must pick an item which you can invest around 10-100 million gold in within 4 hours, but also one which is bought and sold regularly.