The semi-fungible standard for unique, graded assets.
Diamonds, emeralds and other graded stones are individually unique — no two parcels are interchangeable — so they cannot be represented by a fungible, ERC-20-based token. T-Mines issues them as ERC-3525 semi-fungible tokens (SFTs): one certificated stone is bound to one slot and tokenId, with its grading certificate referenced on the tokenId. Every contract still runs on the same ONCHAINID / ERC-3643 compliance stack.
Debt (TMCT), equity (TMFT) and fungible metals — gold, silver, platinum — settle by whole-unit transfer. One unit is identical to the next, so a fungible permissioned-security standard is the native fit.
A graded stone is one of a kind. An SFT binds that single stone to one slot and tokenId, so unique per-parcel title is preserved on-chain. Settlement is by value decrement against a specific tokenId — never by interchangeable whole units.
Distinct stones must never share a slot — if they did, unique per-parcel title would collapse into fungibility. The grading certificate is referenced on the tokenId, and a token’s value field may fractionalize that single stone only, splitting ownership of one parcel without ever pooling two different stones.