# Gemstone Identifier º vs Marble

The clearest difference is rating: Gemstone Identifier º at 4.2 against Marble's 1.0. Gemstone Identifier º also leads on ratings volume (13 vs 1) and iOS requirement (15.0 vs 17.6). On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Gemstone Identifier º sells 2 in-app purchases, starting at $6.99 per 7 days and Marble sells 5 in-app purchases, starting at $9.99 per 7 days. Whichever you choose, the download price is not the number that matters.

Gemstone Identifier º holds the better App Store score, 4.2 against 1.0. That said, the two scores are not equally well evidenced: Gemstone Identifier º has 13 ratings behind it against 1, so its average is the more settled of the two.

Gemstone Identifier º ships an update every 5 months, Marble every 3 months. The most recent releases landed on November 5, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Gemstone Identifier º | Marble |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.2 (13 ratings)](https://appshunter.io/ios/app/gemstone-identifier/id6755660796/reviews)** | [1.0 (1 ratings)](https://appshunter.io/ios/app/marble-ai-3d-world-maker/id6787258973/reviews) |
| Number of ratings | **13** | 1 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 3 months** |
| Monetization | Freemium | Free with in-app purchases |
| Size | 64 MB | 63 MB |
| Requires iOS | **15.0** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Qualitechnologies LLC](https://appshunter.io/developer/1855338819) | [EMINE ALTINTOP](https://appshunter.io/developer/6775622504) |

## What reviewers say

### Gemstone Identifier º

[App page](https://appshunter.io/ios/app/gemstone-identifier/id6755660796)

Instantly identify gemstones, rocks, and minerals from a photo. Discover their value, history, care instructions, and authenticity. Chat with an AI expert and manage your collection.

**Highlights:** Identify stones by photo, Estimate stone value, Detect fakes, Detailed stone facts, AI gem expert chat, Collection management, Metal detector

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly | $6.99 | per 7 days |
| Gemstone Identifier Premium | $34.99 | per year |


### Marble

[App page](https://appshunter.io/ios/app/marble-ai-3d-world-maker/id6787258973)

Transform photos or text into explorable 3D worlds. Step inside your creations, from real places to imaginary landscapes, without complex software or VR headsets. Share your immersive scenes with friends.

**Highlights:** Generate 3D worlds from single photos, Create scenes from text descriptions, Explore worlds by panning, orbiting, and stepping, No modeling software or VR headset required, Save and revisit created worlds, Share scenes with friends

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

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Marble Weekly | $9.99 | per 7 days |
| Marble Yearly | $69.99 | per year |
| Marble Credits | $9.99 | one-time |
| Marble Credits | $19.99 | one-time |
| Marble Credits | $29.99 | one-time |


## Frequently asked questions

### Is Gemstone Identifier º free?

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

### Is Marble free?

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

### Which has better reviews, Gemstone Identifier º or Marble?

Gemstone Identifier º is rated higher. Gemstone Identifier º averages 4.2 out of 5 from 13 ratings, while Marble averages 1.0 from 1 ratings.

### Do Gemstone Identifier º or Marble have ads?

Neither Gemstone Identifier º nor Marble shows ads.

### Which is updated more often, Gemstone Identifier º or Marble?

Gemstone Identifier º ships an update every 5 months, and Marble every 3 months. Most recently, Gemstone Identifier º was updated on November 5, 2026 and Marble 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.*