The Emblem shop is the third section in the marketplace

Emblems are icons of ore that user can unlock upon trading in 100 of the corresponding ore in the marketplace menu (so its required that users have their Marketplace unlocked to obtain emblems). Once an emblem is unlocked, the player can equip one emblem at once and have it appear on top of their head but the player wouldn't be able to see it. Emblems are also seen as chat / shout prefix as it can be seen symbol of the user's accomplishments in Azure Mines. Currently there's an emblem for every ore except Garnet (as it's not found in the emblem menu, this may be due to Garnet not having an emblem), the Pumpkinite (icon has not been added yet), and the Dragonstone emblem cannot be obtained as users can mine but not obtain Dragonstone.

There shouldn't be a tier list as it's a matter of opinion and Berezaa had not said anything about ranking emblems. Instead, the emblems can be ranked by rarity of the ore - TheWikiaEditMachine.

Ore Icon Difficulty
Stone Stone Icon Freebie
Coal Coalicon Cake Walk
Iron Itemiron Cake Walk
Sulfur Sulfur Easy
Silver Silver-0 Easy
Copper Itemcopper Easy
Gold Itemgold Easy
Sapphire SapphireIcon Moderate
Ruby Itemruby Moderate
Emerald Itememerald Moderate
Diamond Itemdiamond  Moderate
Amethyst Itemamy  Moderate
Dragonglass Itemdragon Challenging
Painite Itempain Challenging
Twitchite Icontwitch Challenging (but only available when Berezaa is Twitch streaming)
Boomite BoomiteIcon Challenging (Dragonglass pickaxe needed which is mined below 2000m)
Platinum Platinumicon Challenging
Very Rich Coin Challenging
Topaz Itemtopaz Challenging
Opal Itemopal Hard
Baryte Itembar Hard
Plutonium Itempluto Hard
Newtonium Newtoniumicon Hard
Uranium Itemur Hard
Serendibite Itemserend Hard 
Garnet None Hard (Can't be seen as the garnet icon is glitched. Click underneath the Twitchite emblem to find it.)
Azure AzureOreIcon Extreme
Moonstone Itemmoon Extreme (much easier to obtain when a player has access to a VIP server and is restarted every time the user mines all the Moonstone)
Rainbonite Itemrain Extreme
Kappa Kappiteicon-0 Insane (unless the user has the Navigation Kit gamepass which allows them to see coordinates of their position in relation to Kappa's position (it never changes, read more on the page).
Illuminunium Item3 Insane
Mithril Mithril Icon 2 Insane
Ambrosia Itemambro-0 Almost Impossible
Dragonstone Stone Icon Unobtainable
Pumpkinite None Unobtainable (unless you have enough Pumpkinite from the 2017 Halloween Event or you trade for enough Pumpkinite.)
Unobtainium Itemuo Broken (game looks for unobtainium (an ore in you would have in your inventory) rather than uC (the currency))

Note: More emblems may be added in the future.