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There are nine different colors to pick from.
Color dyes have been added which will permanently change the color of a weapon, shield, helmet or body armor. These rerolls magic and rare items and adds mods based on the item level. Mithril and Adamant's Glyph's have been added and can be used with weapons and armor.
Many new cube recipes, including the ability to add sockets to weapons and armor via new items simply called sockets which spawn about the same frequency as gems do. All Ladder and 1.11 runewords are ebabled, with numerous added runewords as well. Many new unique items and new rare and magic properties have been added. All crafting recipies have been improved and have new exceptional/elite versions recpies. New crafting recipies for Topaz, Skull and Diamond type gems. All unique items and set items have had changes made to them. Throwing Weapons and Javelins spawn in stacks of 300 and can now have sockets. Inventory size, stash size and cube have been increased by 50%. superuniques commonly drop yellow items, and bosses will drop set and unique items more frequently. Boss and superunique droprates have been improved. Revamped drop system with slightly increased drop rates for rare, set and unique items. Gambling has been greatly improved and given better odds. Gems and runes can now be bought at high prices as well. Shops now sells Nightmare and Hell equipment in later difficulties. Bosses have special Hitpoint Bars that are much bigger than those on normal monsters. They're similar to champions, but more powerful. A new monster type called Elite monsters have been added. New boss and monster graphics from Baldur's Gate II, Icewind Dale II and Planescape Torment. Old bosses have been buffed to be on par with the new ones. The total boss count in the game is now 47, all with their own unique taunts, attacks and strategies. New regular monster, superuniques and bosses. New monster skills for bosses and regular monsters.
Four new mercenary types have been added. Mercenaries can now equip the same items as the player, receive new skills on the higher levels and can equip a wider variety of weapons. Strength and Dexterity have been reworked, and now have a larger impact on weapon damage. New and rebalanced skills for all classes. Diablo II: Resurrected Review - Pile Of Old Bones