ores

what are the ores i need to keep for future use? i have so many ores on my mule to the point when they are actually taking too much space on it.

I know of-
Garnet: some low level quest
diamond: sauna robe quest
bronze: oxygen tank quest
steel: oxygen tank quest
oricalcom: Omega Sector quest

Item Maker?

You want to keep...

• Steel, because it's highly demanded by many things, and the HT admission quest.
  
• Mithril, because it's demanded by the HT admission quest. A few quests asks for this too.
  
• Bronze, never know when you need Screws for quests. (although if you abused the orbis exchange quest, I think you'll have plenty of screws)
  
• Emerald, for the quest junkies (if you don't quest, you can skip this one)
  
• Garnet, for the same reason above.
  
• Black Crystal, since you need massive quantities of it to make some stuff.
  
• Dark Crystal, for 3rd job quest.

Additionally, in the future of MapleStory, there will be a skill that lets you make your own equipment and stuff. Part of it is using any jewel to enhance your own equipment upon making them. Refer to Isaac's thread for more information.

Additionally, you can optionally add new "graded" jewels to the formula. These are made from your standard gems (Diamond, Garnet, etc.) by putting them through the maker skill and appraising them. Each time you do this, it takes 100k. It has a high rate of coming out as low grade, a fair rate of coming out as Mid grade, and a low rate of coming out as High grade. I think it's 70%, 25%, 5%, but I'm not positive. The grade will be denoted by a tiny mark in the corner, like a scrolled item. To upgrade it, all you do is select from the drop down list the "Jewels" and then in the list beside it, pick out the jewel you are upgrading, and then hit go:

 Spoiler

Like Legendary Spirit, it has a "loading bar" style, so you'll have to wait a moment to see what you got. In this case, I got a low grade. The use of these graded jewels is totally optional.
The item usages are as follows (information provided by Loose, which was originally from a deleted post by Fiel on sleepywood):
Type of Crystal - Stat added - [Low Grade, Mid Grade, High Grade]
Diamond: Weapon Attack [1, 2, 3] - Only usable on weapons
Sapphire: Magic Attack [1, 2, 3] - Only usable on weapons
Garnet: Accuracy [2, 3, 5]
Opal: Avoid [2, 3, 5]
Aquamarine: Jump [1, 2, 3]
Amethyst: Speed [1, 2, 3]
Topaz: HP [10, 20, 30]
Emerald: MP [10, 20, 30]
Black Crystal: Random [1, 2, 3]
Dark Crystal: Random [2, 3, 5]
Power Crystal: STR [2, 3, 5]
DEX Crystal: DEX [2, 3, 5]
Wisdom Crystal: INT [2, 3, 5]
LUK Crystal: LUK [2, 3, 5]
Secret Crystal: Level Requirement [-1, -2, -3] - Not yet available in game.

[Low Grade, Mid Grade, High Grade]

Every different type of gem has a different affect on the end item. The stat crystals add the stat they are related to (IE, Dex Crystal will add Dex, etc.) Diamonds add weapon Attack, but they can only be used on weapons. Sapphire adds Magic attack, so it is a separate gem, and mages won't have to deal with price hikes on Diamonds. It, too, only works on weapons. These don't affect the slots at all, so you end up with an above average item with different stats on it. There's no chance of the item breaking if you add a graded jewel to the formula. This is great, because you can use this skill to add a stat that isn't normally found on something (For example, use a LUK crystal to add luck to an overall, or shoes) and then start tossing Chaos Scrolls on it. It really opens a lot of doors when used in conjunction with Chaos Scrolls.

There's a level 6x quest that requires 60 sapphire ores.

Maker is bets bet to remove it, steel is always in use, mirthil is for HTPQ, and if you need space, MTS is good.