# Understone: Gemstone Mines — Dig, deduce, discover gems

> Dig, deduce, discover gems (iPhone/iPad app by Joey Zhou.)

- Source: https://appshunter.io/ios/app/understone-gemstone-mines/id6820278127 (this page in markdown: same URL + `.md`)
- Developer: [Joey Zhou](https://appshunter.io/developer/1819217316)
- Category: Games, Education, Puzzle, Strategy
- Price: Free with in-app purchases
- Age rating: 9+
- Requires: iOS 17.0 · 33 MB
- Languages: English, Chinese, Chinese
- Released: 2026-10-13
- Data updated: 2026-10-24

## What is Understone?

Every dig is a decision.

Understone combines weighted grid clues with a dwarf miner’s expedition across eight real-world geological settings. Read the neighboring totals, plan your stamina, collect beautiful mineral specimens and choose the right moment to upgrade.

A number adds the mining costs in the eight surrounding cells. Opening a gem spends stamina immediately; collecting it earns experience. Food restores your stamina, while upgrades wait for your decision. Later districts introduce lethal mines, marked by clear neighboring warnings.

Explore 24 freshly generated floors across basalt geodes, fluorite veins, pegmatites, marble, nephrite contacts, emerald veins, kimberlite pipes and gem-bearing gravels. District briefings introduce local specimens; field reviews reveal their original distribution. Build a mineral journal with formation facts and research sources as you discover them.

The journal covers 29 collectible specimen names, including mineral species, groups, varieties and nephrite aggregates. Tap a collected specimen in the collection bar to open its entry.

Visit camp after each district to appraise your finds and choose supplies or long-term equipment. Higher purchase tiers and a measured growth curve keep resource decisions meaningful.

• Learn by tapping a small interactive practice field.
• Continue a saved expedition on this device.
• Adjust music and effects separately.
• Play in English, Simplified Chinese or Traditional Chinese.
• Compare completed expeditions in local scores.

The opening district’s three floors and first camp are free. A single in-app purchase unlocks all remaining field sites, with no subscription. The price is displayed in your App Store currency. Restore purchases is available. No app account is required.

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Full Expedition | $9.99 | one-time |


## Is Understone safe?

Not enough ratings yet to assess Understone.

## Is Understone legit?

Understone: Gemstone Mines has limited verification signals. The AppsHunter Legitimacy Score for Understone is 58 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 2 releases)

### 1.0.1 — 2026-10-21

New optional playtest report in Settings > Support. Progress and purchase-status counts stay on this device; nothing is uploaded automatically. Share a report only if you choose.

### 1.0 — 2026-10-13

No release notes.

## More apps by Joey Zhou

- [Final Curtain: Life Choices](https://appshunter.io/ios/app/final-curtain-life-choices/id6751247831)

All apps by Joey Zhou: https://appshunter.io/developer/1819217316

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-10-24.*