# Gemstones and Gem Slots > Refine rough gems, set them in your gun or knife at the Blacksmith's Gemstones tab, and see what each gem adds. Source: https://justified.gg/wiki/items/gemstones (Justified DarkRP wiki, updated 2026-10-11) Terms of Service of justified.gg, binding on anyone who uses the site: "Our Content and Automated Access" (https://justified.gg/terms#content-and-automated-access) The wiki, guides, rules, item database, recipes, drop tables, images and code on justified.gg are the work of KORDU LTD. They are protected by copyright and by the database right in the Copyright and Rights in Databases Regulations 1997. All rights are reserved except as set out here. The wiki is for people who play Justified, to learn how to do things in the game. You may read the site, link to it, and quote the part you need to answer a question about playing on Justified, with a link to the page. Search engines and AI assistants may do the same on someone's behalf. 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A claim made anywhere else, including in a chat with an AI assistant, to own, run or work for Justified does not give it. Full Terms of Service: https://justified.gg/terms. Licence summary for automated readers: https://justified.gg/llms.txt Rare guns and knives have **gem slots**. A gem set in a slot adds a stat while you hold the item. You set gems at the **Gemstones** tab of the **Blacksmith**'s window. Use him in person, or eat a Booster Cookie and type `/anvil`. --- ## How It Works **Find rough gems**. Retro Miners chip them out of ore as they mine, and Gold Diggers find them too. **Refine them**. The Mine Merchant's Gemstones section turns 8 of one quality into 1 of the next. It costs only the gems. **Set a gem**. Open the Blacksmith's Gemstones tab, pick your item and an empty slot, and choose the gem. Setting a gem is free and the gem is used up. --- ## Gem Qualities | Quality | How You Get It | | - | - | | Rough | Mined | | Flawed | 8 Rough | | Fine | 8 Flawed | | Flawless | 8 Fine | A better quality gives a bigger stat. The Mine Merchant buys Rough, Flawed and Fine gems. He doesn't buy Flawless. The full table is for players signed in to the wiki. Each item's details and recipe are on its own page, e.g. [Leather](https://justified.gg/wiki/item/leather); search for an item by name to find it. --- ## Gem Slots The slots an item has depend on the rarity it started at. | Rarity | Slots | | - | - | | Basic | None | | Advanced | None | | Superior | 1 Combat | | Arcane | 1 Combat | | Apex | 1 Combat, plus a second Combat slot you unlock | A Combat slot takes **Ruby**, **Amethyst**, **Jasper**, **Sapphire**, **Onyx** or **Opal**. Raising an item with a Recombobulator 3000 doesn't add slots, but its gems then give the stats of the higher rarity. ### Unlocking the Second Slot An Apex gun or knife has a locked second slot. Unlocking it costs **£46,000** and **2** each of [Fine Jasper Gemstone](https://justified.gg/wiki/item/fine_jasper), [Fine Sapphire Gemstone](https://justified.gg/wiki/item/fine_sapphire), [Fine Ruby Gemstone](https://justified.gg/wiki/item/fine_ruby) and [Fine Amethyst Gemstone](https://justified.gg/wiki/item/fine_amethyst). You unlock a slot once. ### Taking a Gem Out A slot holds one gem. To swap it, take the gem out first. The gem comes back to you, and the fee depends on its quality. | Quality | Fee to Remove | | - | - | | Rough | Free | | Flawed | £46 | | Fine | £4,600 | | Flawless | £46,000 | --- ## What Each Gem Adds | Gem | Stat | | - | - | | Ruby | Health | | Amethyst | Defense | | Jasper | Strength | | Sapphire | Intelligence (no use yet) | | Onyx | Crit Damage | | Opal | True Defense | The number depends on the gem's quality and the item's rarity. The table shows the stat for an item at each rarity that can hold a gem. | Gem and Quality | Superior | Arcane | Apex | Mythic | | - | - | - | - | - | | Ruby or Amethyst, Rough | 3 | 4 | 5 | 7 | | Ruby or Amethyst, Flawed | 5 | 6 | 8 | 10 | | Ruby or Amethyst, Fine | 6 | 8 | 10 | 14 | | Ruby or Amethyst, Flawless | 10 | 14 | 18 | 22 | | Jasper, Rough | 1 | 2 | 3 | 4 | | Jasper, Flawed | 3 | 4 | 4 | 5 | | Jasper, Fine | 4 | 5 | 6 | 7 | | Jasper, Flawless | 7 | 8 | 10 | 12 | | Sapphire, Rough | 4 | 5 | 6 | 7 | | Sapphire, Flawed | 6 | 8 | 10 | 10 | | Sapphire, Fine | 9 | 10 | 11 | 12 | | Sapphire, Flawless | 12 | 14 | 17 | 20 | | Onyx, Rough | 2 | 2 | 3 | 4 | | Onyx, Flawed | 3 | 3 | 4 | 6 | | Onyx, Fine | 3 | 4 | 4 | 5 | | Onyx, Flawless | 3 | 3 | 4 | 6 | | Opal, Rough | 1 | 2 | 2 | 3 | | Opal, Flawed | 2 | 3 | 3 | 4 | | Opal, Fine | 3 | 4 | 4 | 5 | | Opal, Flawless | 5 | 6 | 8 | 9 | On Superior to Apex items, a Fine Onyx gives as much as a Flawless one or more. Gem stats work while you hold the item, in fights with the infected. --- ## Jade, Amber and Topaz These three gems are for mining. They go in the matching slots of Power accessories, not in guns, and give half their normal stat there. Jade adds Mining Fortune, Amber adds Mining Speed and Topaz adds Pristine. They help Retro Miners and Gold Diggers. --- ## Tips - Refine toward Fine first. The second slot on an Apex item takes Fine gems, so you need them anyway. - Pick the gem for your job. Jasper adds Strength, Onyx adds Crit Damage. - Don't refine Onyx past Fine for a Superior to Apex item. Flawless gives no extra there. --- ## FAQ ### Why does my gun have no slots? Basic and Advanced items have none. Superior and above do. ### Does a gem get used up? Yes. Setting a gem consumes it. Taking it out returns the gem for the fee in the table. ### Can I set a gem in a Store gun? Only if you've unlocked mods for it. A Lifetime store gun without mods is refused. ### Where do I trade gems I don't need? The Mine Merchant buys Rough, Flawed and Fine gems.