Investment-related Gems mentioned in this article are for reference only and do not constitute investment advice. Gem behavior may change as Google Gemini and authors update them — verify accuracy when you use them.
So many Gemini Gems out there — how do you actually pick one?
Open Gemini, scroll through community-shared Gems, and you'll find a lot of them. But pick one at random and you'll often find the answers feel no different from regular Gemini.
The problem isn't Gemini — it's that the Gem's instructions weren't designed well.
To judge whether a Gem is worth using, four things tell you almost everything: is the role tightly defined (a domain specialist, not a swiss-army knife), does it force a search for current data (so it doesn't pull from training memory), does it clearly mark "unavailable" when data is missing (instead of fabricating), and is it tuned for the specific language and context you'll use it in.
Below are 10 Gems from this site that pass all four bars and have been iterated on dozens of times. Grouped into 6 categories with direct access links.
Investing: Research aids, not investment advisors
1. RayStock AI — Full-spectrum Taiwan stock analysis
The most complete Taiwan-stock research assistant on the site. Type in a ticker and it pulls today's quotes, institutional flows, dividend records, and risk grading — every number cited. Institutional flow analysis, ETF comparisons, and price-volume reads are all included. It won't give you investment advice, but it will hand you a research note you can actually use as a starting point for decisions. Built for daily-watching Taiwan stock investors who want fast multi-angle data.
2. RayBuffett — Berkshire Hathaway 13F tracker
Follow Buffett's buys and sells. Pulls SEC 13F filings to show what Berkshire Hathaway added, trimmed, exited, or initiated each quarter. Not just a list — it interprets why a position was bought or sold and applies a value-investing lens to evaluate whether the move makes sense. Built for long-term investors who want institutional-position context.
Work productivity: hand off the routine stuff to AI
3. RayMarketing — Social media post writer
Writing IG / Threads / Facebook posts every day and out of ideas? This Gem hardcodes a marketing-advisor persona and produces variants in different voices based on your product, audience, and platform. Includes hooks, story structure, and CTAs — output doesn't read like generic "AI copy."
4. RayReply — Difficult-customer response advisor
Client pushing back again? This Gem specializes in tricky customer communication: price haggling, refund demands, unreasonable complaints, scope creep beyond the contract. It unpacks the customer's actual ask and produces polite-but-firm response templates — saving you from writing something you'll regret in the heat of the moment.
5. RayTranslator — Context-aware multilingual translation
Not a literal translator. It switches translation style based on context (formal correspondence, social posts, product copy, casual conversation), and proactively flags "this would sound unnatural translated literally — consider this instead." Supports English, Chinese, Japanese, Korean — built for cross-border e-commerce, trade, and media work.
→ RayTranslator Complete Guide
Legal & safety: don't get cheated, don't get scammed
6. RayLabor — Taiwan labor law expert
Boss skipping out on overtime pay? Employers find creative ways to dodge labor laws — this Gem evaluates whether specific actions are illegal, cites article numbers, and walks you through filing complaints. Tone is neutral but doesn't cop out — when a situation is legally ambiguous, it tells you "the statute isn't explicit, but case-law tends to favor…"
7. RayAntiScam — Fraud detection assistant
Got a suspicious SMS, LINE message, or out-of-the-blue investment pitch? Paste the content in and this Gem walks through it from a fraud-detection angle — what type of scam pattern this matches, which psychological-manipulation tactics are at play, how to respond, and whether to file a report. Especially useful for older family members — they can just screenshot a suspicious message and forward it for first-line judgment.
Learning & creativity: use AI as a tutor
8. RayClassical — Classical Chinese translator
"Since we're here, we might as well stay" doesn't actually mean "we're already here." This Gem translates and analyzes Classical Chinese — modern translation, character-level annotations, source citations, and modern usage contexts. Useful for students, history enthusiasts, and writers who want to quote classical phrases without misusing them.
9. RaySketch — Hand-drawn sticker studio
Want custom stickers, avatars, or social media art but can't draw? This Gem pairs with Gemini's image generation to produce hand-drawn-style characters, expression packs, and LINE-style stickers. It walks you through style, color, and pose decisions step by step — no prompt-engineering experience needed to get a usable result.
Lifestyle: change of pace, occasionally
10. RayDream — Dream interpretation
Had a weird dream and woke up confused? This Gem uses dual-track psychological analysis (Freudian and Jungian frames) to interpret dreams — not the superstitious "snakes mean enemies" version, but reading dream elements against your recent life context. Works well as a self-reflection tool.
Why these 10 made the cut
A few traits in common:
- Tightly defined roles: each Gem owns a specific domain — not a "general assistant"
- Mandatory live search: for investing, legal, and fraud-detection topics where currency matters, the instructions force a search before answering
- Honest failure handling: when data isn't available, it says so — no hand-waving
- Context-tuned: Taiwan-specific news, regulations, and cultural nuances are baked in — not just translated English prompts
- Clear scope limits: ask something off-topic and it politely declines instead of bluffing
These sound basic, but try the average shared Gem and you'll find most of them fail on at least one.
How to start using these
Click any Gem's guide above and use the "Open in Gemini" button — it takes you straight to the chat. A free Google account is enough — the only difference is free runs on Flash while paid plans run on Pro, and Pro is noticeably better on complex tasks. See Gemini Free vs Paid for the breakdown.
If you want to know how the instructions behind these Gems are designed, How to Write Gem Instructions covers the core techniques — read it and you can build your own Gems with similar quality.
FAQ
Are all 10 of these Gems free to use?
Yes. Gems became free for all Google accounts in 2025 — both creating and using are free. The only difference is the underlying model: free uses Flash, paid (Plus / Pro / Ultra) uses Pro. For complex investment analysis or long-document work, Pro noticeably improves quality. For one-off questions or casual chat, Flash is fine.
Can I edit the instructions of these Gems myself?
Not the author's version directly — but you can use them as inspiration to build your own. Gemini doesn't have a "fork" function; each Gem's instructions are private to its author. If you want a custom version, read the related guide to understand the design, then write your own from scratch — it's easier than it sounds.
Why aren't all of the Ray-series Gems on this list?
This site has more Gems than the 10 here — including Hong Kong stocks, Japan stocks, fitness, fortune-telling, JavaScript interview prep, pun generation, and more. This list is the "broadest-applicable, most universally-useful" cut. For the full directory, head to the homepage.
Do these Gems work on mobile?
Yes. The Gemini app (iOS / Android) shares the same Gems as the web — sign in to the same Google account and they all show up. Mobile is especially nice for RayAntiScam (just screenshot a suspicious message), RayDream (jot down a dream when you wake up), and RayTranslator (when you're traveling).
How often is this list updated?
When new Gems launch, or when an existing Gem ships a meaningful upgrade, this list gets revisited. Last written 2026-04-28 — future updates will be marked at the top.
Further Reading
- What Are Gemini Gems? A Complete Beginner's Guide — Not sure what a Gem is? Start here
- How to Write Gem Instructions: 7 Tips for Better AI Responses — Want to build your own?
- Gemini Free vs Paid: What's the Difference? — Which plan runs these Gems best
- Browse All Featured Gems →