> For the complete documentation index, see [llms.txt](https://doc.cryptostone.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://doc.cryptostone.org/introduction/06_representation_of_gemstone_attributes.md).

# 06 Gemstone Attribute Expression

The value of a gemstone is not determined merely by its type. Even among diamonds, market value differs depending on weight, color, clarity, and cut.

To represent these gemstone attributes in a digital environment, CryptoStone assigns the following four core attributes to each Gem NFT.

| Attribute | Meaning                           |
| --------- | --------------------------------- |
| Weight    | The weight of the gemstone        |
| Color     | The color grade of the gemstone   |
| Clarity   | The clarity grade of the gemstone |
| Cut       | The cut grade of the gemstone     |

These four attributes are determined at the time of mining and cannot be changed after issuance. This digitally implements a structure similar to how real gemstones are evaluated based on individual attributes after appraisal.

In CryptoStone, each NFT is not merely a token pointing to an image file. It is a digital asset that directly holds gemstone attribute values. Images, 3D models, and visual card formats may serve as auxiliary elements for user experience, but the essence of a CryptoStone NFT lies in the attribute data recorded on-chain.


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