# Rock Identifier vs Diamond Tester

The clearest difference is monetization model: Rock Identifier at free with in-app purchases against Diamond Tester's subscription. Rock Identifier also leads on ratings volume (235 vs 1) and iOS requirement (15.1 vs 18.0). Diamond Tester's advantage is rating (5.0 vs 4.5). On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Rock Identifier sells 3 in-app purchases, starting at $6.99 per 7 days and Diamond Tester sells 2 in-app purchases, starting at $4.99 per 7 days. Whichever you choose, the download price is not the number that matters.

Diamond Tester holds the better App Store score, 5.0 against 4.5. That said, the two scores are not equally well evidenced: Rock Identifier has 235 ratings behind it against 1, so its average is the more settled of the two.

Rock Identifier ships an update every 9 days, Diamond Tester every 2 weeks. The most recent releases landed on November 10, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Rock Identifier | Diamond Tester |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.5 (235 ratings)](https://appshunter.io/ios/app/rock-identifier-gem-value/id6752249234/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/diamond-tester-crystalscan/id6761496340/reviews)** |
| Number of ratings | **235** | 1 |
| Positive reviews | 70.6% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 9 days** | Every 2 weeks |
| Monetization | **Free with in-app purchases** | Subscription |
| Size | 52 MB | 21 MB |
| Requires iOS | **15.1** | 18.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [nurten cay](https://appshunter.io/developer/1835928050) | [Bouazza El Amri](https://appshunter.io/developer/1834967332) |

## What reviewers say

### Rock Identifier

[App page](https://appshunter.io/ios/app/rock-identifier-gem-value/id6752249234)

Identify rocks, minerals, crystals, and gemstones instantly with a photo. Get detailed information on properties, hardness, and value. Learn to distinguish authentic stones from imitations.

**Highlights:** Instant rock, mineral, crystal & gemstone identification, Detailed stone information (name, hardness, properties), Estimated gemstone value ranges & rarity insights, Authenticity indicators for imitations/treatments, Compare similar stones, Save favorites and build a collection

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| rock_weekly | $6.99 | per 7 days |
| rock_yearly | $39.99 | per year |
| rock_yearly_free_trial | $49.99 | per year |


### Diamond Tester

[App page](https://appshunter.io/ios/app/diamond-tester-crystalscan/id6761496340)

This app uses AI and your device's camera to authenticate and grade diamonds and gemstones. It provides instant analysis, detailed 4C grading, and generates professional PDF appraisal reports. You can also chat with an AI gemologist and save your collection.

**Highlights:** Instant stone authentication, Complete 4C grading, Advanced visual analysis, AI gemologist chatbot, Professional PDF reports, Personal collection vault

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| PRO Weekly | $4.99 | per 7 days |
| One-time Payment | $34.99 | one-time |


## Frequently asked questions

### Is Rock Identifier free?

Rock Identifier is free to download, with in-app purchases available.

### Is Diamond Tester free?

Diamond Tester is free to download, with in-app purchases available.

### Which has better reviews, Rock Identifier or Diamond Tester?

Diamond Tester is rated higher. Rock Identifier averages 4.5 out of 5 from 235 ratings, while Diamond Tester averages 5.0 from 1 ratings.

### Do Rock Identifier or Diamond Tester have ads?

Neither Rock Identifier nor Diamond Tester shows ads.

### Which is updated more often, Rock Identifier or Diamond Tester?

Rock Identifier ships an update every 9 days, and Diamond Tester every 2 weeks. Most recently, Rock Identifier was updated on November 10, 2026 and Diamond Tester on October 31, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*