Starter · Level 1 of 3
A Gemini Gem is a saved version of Google’s Gemini chatbot that you set up once with standing instructions, then reuse instead of retyping the same context into every new chat. You build one at gemini.google.com by clicking “Explore Gems,” then “New Gem,” naming it, and writing instructions for how it should behave. Gems are free with any personal Google account (13 and up), take about five minutes to set up, and sync automatically to the Gemini mobile app once saved. Below is the exact process, plus where a free Gem beats — and loses to — a paid custom GPT.
What Is a Gemini Gem, Exactly?
Think of a Gem as a saved expert inside Gemini. A normal Gemini chat forgets its context the moment you start a new conversation, so if you want the same tone, format, or role every time, you end up pasting the same paragraph of instructions over and over. A Gem skips that step. You write the instructions once — “you are a blunt weekly-review coach who turns a messy brain-dump into three sections: wins, blockers, next actions” — and every future chat with that Gem starts already knowing the assignment.
Gems launched in August 2024 as a Gemini Advanced and Google Workspace feature, then rolled out to free Gemini accounts in stages through early 2025. Custom Gems are now available to any personal Google account without a subscription — the paid tier’s advantage is which underlying model answers your questions, not whether you can build a Gem at all.
What You Need Before You Start
You need a personal Google account, and you need to be at least 13 (or the minimum age set by your country). A work or school account can use Gems too, but Google requires those users to be 18 or older, and a Workspace admin has to turn on a Gemini license before Gems show up inside Gmail, Docs, or Sheets. If you already use Gemini for everyday questions, you meet the requirement — you’re just about to use a feature you probably haven’t opened yet.
One limitation worth knowing up front: you can only create, edit, or delete a custom Gem from the Gemini web app at gemini.google.com. Once it exists, it appears in the Gemini mobile app and the Gemini side panel inside Workspace automatically — you just can’t build one from your phone.
How to Build Your First Gem, Step by Step
Here’s the full process, using a Gem worth having on hand: a weekly review assistant that turns a rough list of what happened this week into three clean sections. Rebuild it with your own instructions once you see the shape.
- Go to gemini.google.com and sign in with your Google account.
- Click “Explore Gems” in the left sidebar, then click “New Gem” in the top corner of that screen.
- Give it a name. Something specific beats something clever — “Weekly Review Assistant” tells you what it does six months from now; “Review Bot” does not.
- Paste instructions into the Instructions box (the exact wording is below). Gemini can also rewrite or expand your instructions for you if you want help tightening them.
- Optional: click “Add files” under Knowledge and upload a document your Gem should reference — last week’s notes, a style guide, a project brief.
- Test it. Type a real prompt into the preview pane on the right before you save anything, and adjust the instructions if the output isn’t what you wanted.
- Click Save. Your Gem now lives in “Explore Gems” and syncs to mobile and Workspace automatically.
The Exact Instructions to Paste In
This is the instruction text for the weekly review Gem above. Copy it, then swap the details for your own routine:
You are a weekly review assistant. When I paste in a rough, unstructured list of what happened this week, reorganize it into three sections: Wins (what actually got finished), Blockers (what stalled and why, in one line each), and Next Actions (three to five specific tasks for next week, each starting with a verb). Keep the tone plain and direct. Do not add encouragement or commentary — just the reorganized list. If something I wrote is ambiguous, put it under Blockers with a note that it needs clarification rather than guessing.
Notice what the instructions do: they name the exact output format, tell the Gem what to leave out, and give it a rule for handling ambiguous input. Vague instructions (“be helpful with my weekly reviews”) produce vague, inconsistent output — a Gem is only as sharp as the instructions you write once.
Should You Add Knowledge Files?
Knowledge files are optional, and most first Gems don’t need them. They matter when your Gem needs to reference something that changes or that you don’t want to retype — a running list of client names for an intake Gem, a style guide for a writing Gem, or last month’s numbers for a reporting Gem. Upload the file once under “Add files,” and the Gem references it on every future chat without you re-uploading. Skip this step for a first Gem and add it later once you know what your Gem keeps having to ask you for.
Don’t Want to Build One Yet? Start With a Premade Gem
Google ships five premade Gems if you want to see how the format behaves before writing your own instructions: Brainstormer, Career Guide, Coding Partner, Learning Coach, and Writing Editor. They live on the same “Explore Gems” screen you used above — open one, run a real prompt through it, and pay attention to how consistent the tone stays across follow-up questions. That consistency is the behavior your custom Gem should match once you build it.
Where Your Gem Shows Up After You Save It
Once saved, a Gem shows up in three places automatically: the “Explore Gems” list on the Gemini web app, the Gems menu in the Gemini mobile app on Android and iOS, and — if your account has a Gemini license — the Gemini side panel inside Gmail, Docs, and Sheets. You never have to re-create or re-sync it. The only thing you can’t do from mobile is build a new one or edit an existing one; those actions stay on the web app.
How to Edit or Delete a Gem Later
Instructions change, and a Gem should change with them. Open “Explore Gems,” find the Gem you built, and use the edit option to revise the instructions or swap out a knowledge file — Gemini keeps the Gem’s identity and conversation history intact through the edit. Deleting works the same way, from the same screen, and removes the Gem everywhere it appeared, including mobile and Workspace. Because editing only lives on the web app, keep a plain-text copy of your working instructions somewhere else, like a notes file, so a phone-only day doesn’t block a quick fix.
Free Gemini Gems vs. a Paid ChatGPT Custom GPT
If you’ve already built a custom GPT in ChatGPT, here’s how the two compare on the details that actually change your setup:
| Detail | Gemini Gem | ChatGPT Custom GPT |
|---|---|---|
| Cost to build one | Free with any personal Google account | Requires ChatGPT Plus ($20/month) to create through OpenAI’s builder |
| Where you build it | Web app only (gemini.google.com) | Web or mobile app |
| Knowledge files | Yes, optional upload | Yes, optional upload |
| Where it shows up after saving | Gemini web, mobile, and Workspace side panel | ChatGPT web and mobile, plus the GPT Store if published |
| Sharing with others | Share a link; the recipient needs their own Google account | Publish privately, by link, or publicly to the GPT Store |
The practical takeaway: if you don’t already pay for ChatGPT Plus, a Gemini Gem gets you the same saved-assistant workflow for nothing. If you’re already a Plus subscriber and want to publish something publicly for other people to find and use, the GPT Store still reaches a wider audience.
Where Gems Fall Short
A Gem is instructions plus optional reference files — it isn’t a workflow tool. It can’t check your calendar, send an email, or trigger anything outside the chat window on its own. If you want an assistant that reaches into your to-do list or your inbox and takes action, you’re looking at a connected automation (Zapier, Make, or Gemini’s own extensions), not a Gem. Treat a Gem as the instruction layer, not the automation layer.
You’ll also lose a Gem’s context between separate chats with it — it remembers its instructions, not your prior conversations. If you’re already comfortable prompting Gemini directly for everyday tasks and re-explaining the same setup each time, a Gem is the version of that where you stop retyping it. And if a Gem’s knowledge file starts feeling like the wrong home for reference notes that keep growing, a proper linked note system — Obsidian is a solid free option — is a better long-term home for that material, with the Gem pointed at an export of it.
Start With One Gem
Build one Gem for the task you retype instructions for most often — a weekly review, a first-draft email reply, a meeting-notes cleanup. Five minutes of setup replaces months of re-explaining the same context to a blank chat window.