Building Custom Gems in Gemini

A regular Gemini conversation is like talking to a smart stranger. It does not know your job, the standards you follow, or the tone your team uses. Every chat starts from zero, which means re-explaining the same context over and over again. Gems fix that by letting you encode your preferences and expertise into a persistent configuration. The result is something closer to talking with a colleague who already knows your work and is ready to get started the moment you open a new conversation.

What a Gem Actually Is

A Gem is a custom version of Gemini that loads a set of instructions before every conversation. You create it once, describe the role and behavior you want, and from then on every chat with that Gem begins with your setup already in place. Each Gem has its own personality and expertise area. A writing editor Gem behaves very differently from a data analysis Gem, and neither sounds like a meeting prep Gem. You are effectively assembling a small team of specialists rather than leaning on one general assistant for everything.

Because Gems live in the Gemini sidebar, you can switch between them instantly. Click into a Gem, drop in your prompt, and you are immediately working with an expert that already knows your standards. Over time, most people build a suite of Gems that line up with the work they do most often, such as email triage, research summaries, client-facing writing, and internal reporting.

Super Gems and the App-Like Experience

In 2026, Google introduced Super Gems, an evolution of the original concept that adds buttons and forms to the interface. Instead of a plain chat window, a Super Gem can present structured inputs that look and feel like a lightweight application. A fitness tracker Gem can include form inputs for daily meals. A project status Gem can include drop-down selections for milestones. A briefing Gem can include short text fields for audience and length. The chat model still does the thinking in the background, but the interaction is closer to a purpose-built tool than a blank prompt.

This matters because it lowers the friction for teammates who do not want to type long prompts every time. They fill in a form, press a button, and get back consistent output.

Creating Your First Gem Step-by-Step

To create a Gem, open the Gem Manager in the Gemini sidebar and click create a new Gem. You will see a form with fields for the Gem's name and instructions. Give the Gem a clear, descriptive name, because the name is what helps you pick it out later. Weekly Report Writer is easier to scan than something vague like Writing.

The instruction field is where the real configuration happens. Write in plain language, as if you are briefing a new team member. A useful recipe is to cover the following points in order:

• Your role and organization, so the Gem knows the context it is operating in.
• The Gem's expertise area and the tasks it will handle most often.
• The response style you prefer, including tone, format, and length.
• Any rules or constraints, like avoiding jargon or never fabricating details.

As an example, an Email Summarizer Gem might be instructed to produce a subject summary, three to five single-sentence bullets covering the key points, a labeled action items section (with a clear no action items note when none apply), a one-word description of overall tone, and an optional draft reply when one is expected. Rules can include no jargon, never invent details, and use clear headers so the output scans quickly.

Optional Configuration and Knowledge Bases

Beyond the instructions field, a Gem can take on a default tool and a knowledge base. The default tool pop-up lets you steer the Gem toward a specific capability, such as image creation, deep research, or another specialized mode. That is useful when a Gem's work is always about the same type of output. For a first Gem, leaving this blank is perfectly fine.

The knowledge section is where Gems really start to feel bespoke. Click the plus icon to attach specific files, Google Drive documents, or notebooks from NotebookLM. These become part of the Gem's reference material, so it can cite your actual policies, templates, or project briefs instead of generic guesses. A client-facing writer Gem can include your brand voice guide. A compliance Gem can include internal policy documents. A meeting prep Gem can include the project charter and the latest status reports.

Test, Refine, Repeat

Once the instructions are in place, click save. You will get a confirmation that the Gem has been created, and you can start chatting with it right away. The first few outputs will almost never be perfect. That is part of the process. Paste in a real example, compare what you get against what you wanted, and then head back to the instructions to refine anything that missed the mark.

Most Gems need two or three passes before they feel dialed in. Common adjustments include tightening the output format, adding missing edge cases like a friendly out-of-office reply, and calling out style preferences explicitly rather than assuming the Gem will infer them. Over time, the instructions become a living document that captures how you like to work.

Gems turn Gemini from a generic assistant into a personalized toolkit. Create one for each recurring task, describe the role and rules plainly, attach reference material when it helps, and expect to iterate a few times before the outputs feel right. With a handful of well-tuned Gems in the sidebar, your most common work gets faster every day, without having to re-brief the model from scratch each time you open a new chat.