|Examine text||A Gilded marble altar with a symbol of Saradomin/Zamorak/Guthix.|
A Gilded altar is the best altar that can be built in a player-owned house. It gives 250% prayer experience when bones are used with it. With one incense burner lit, it gives 300% prayer experience per bone. When both are lit, it gives 350% prayer experience. Any incense burners can be used to gain the same amount of experience. The gilded altar is popular choice for players wishing to train prayer. Often, players will rent out their altars to others.
The gilded altar can be constructed as early as level 66, by using a crystal saw (obtained during the Eyes of Glouphrie quest, it allows you to build things 3 additional levels above your own level) and Spicy stew (this may possibly increase your level +6). In order to receive the +6 Construction bonus you must use three orange spices per stew. These stack to add a +9 construction bonus. Note that using Spicy Stew does not guarantee a +6 bonus.
The total price for all the materials purchased at the shop is: 1,171,325 coins.
Players often advertise their open altars on the official RuneScape forums in the Community section, on the Events thread. Also, the house-party themed world (currently world 31) can be a good place to look for altars.