For the most part people typically do not use too many Large Charms they don't have significantly better rolls than small, take up double the inventory space and can't get +Skills. A Large Charm with at least two max rolls from these categories will be good.

Large Charms: Max Magic Find or a max Life, Mana, Resist or All Resist roll. Certain builds don't get enough of these stats on their gear and need to supplement with Charms. Small Charms: All Resist, Max (11%) to a single Resist, Faster Hit Recovery (FHR) as well as Faster Run and Walk (FRW) are imo the best stats you can get on a Small Charm. Any other Grand Charms with very high FHR, Max Damage, Attack Rating + a high Dexterity or Strength roll can sometimes be in this category too. Paladin Charms are typically the most popular with Sorceress being second. Obviously the more popular class/spec charms will sell for more. Grand Charms: When you Gamble Grand Charms what you are looking for is + to Skills along with an additional roll like Life or Mana. Max roll of a single Resist along with a max Life roll is an example of a good Small Charm. Small and Medium Charms you're looking for max rolls along with a good combination of rolls. Any Grand Charms you find that come with +1 to Skills and nothing else belong in the mediocre section below.

This category is for the best Charms that you can possibly find in the game. If you'd like to see what makes a good Amulet in Diablo 2 check out my what Amulets are worth keeping Guide. People like to do this with Charms to see if they can get anything good as well as with Amulets to see if they can get one for +2 to Skills. To explain what this recipe does in a better way, it basically just rerolls the stats on an item. When you hear about gambling in Diablo 2 with Magic Items most people are probably talking about this recipe. Horadric Cube Upgrading Weapons & ArmorДЈ Perfect Gems (Any Type) + 1 Magic Item = New Magic Item of Same Type Horadric Cube Gambling for Socket Recipes There are certain charms in the game called Baal Charms which are the highest ilvl charms in the entire game and are the charms which are typically chosen for this recipe. While you can do this recipe on any item in the game it is most commonly used on amulets and charms, moreso charms. Any 3 Perfect Gems + a Magic Item is all the combine takes, it'll reroll the Magic Item into something completely new which is usually total garbage. Using the Horadric Cube to Gamble for charms and amulets is one of the more common combines/gambling people do at a high level. Gambling for Charms and Amulets - Diablo 2

Diablo 2 unique charms