Jewelry Retail: GIIS DMDK, UIN, Buyback

A jewelry item at checkout has its own parallel accounting layer — a state control system for the circulation of precious metals and stones, separate from "Chestny ZNAK" and MDLP. On top of that, retail involves operations unconventional for a standard store: buybacks from the public, pawnshop pledges, and trade-ins with additional payment. We analyze where the POS fits in here and where specialized software takes over.

1. GIIS DMDK: What Is Transmitted Upon Sale#

GIIS DMDK is a state integrated information system for monitoring the circulation of precious metals and gemstones. Each registered piece of jewelry receives a UIN (unique identification number). Upon the sale of an item, information about its removal from circulation must be submitted to the system — either automatically via integration of the jewelry store's inventory software with GIIS DMDK, or manually through the system's personal account, depending on which specialized software is used at the location.

The mechanism for verifying and transmitting data to GIIS DMDK works differently from the permissive mode of "Chestny ZNAK" (see general labeling mechanics for comparison) — do not apply the logic of one system to the other by default, check the documentation of the specific GIIS DMDK operator or your jewelry software.

2. Tag with UIN: Scanning and Receipt#

Scanning the tag on the POS by itself does not equal submitting data to GIIS DMDK — these are two separate operations: one occurs in the POS software (assembling the receipt), the second — in specialized software or the system's account dashboard (reporting removal from circulation). Which of them feature an automatic link and where manual stock reconciliation is required depends on the specific inventory software provider, check directly with them.

3. Gold Buyback from Individuals#

Acceptance of jewelry items from an individual for money is a payout, not a sale by the store, and is registered with a receipt marked as "expense". In addition to the receipt, buyback usually requires:

1. Identification of the seller (identity document) — a standard practice for precious metals transactions.
2. Compliance with anti-money laundering legislation requirements if the transaction amount exceeds a certain threshold — check the current edition of the relevant law for exact thresholds and required actions, as they are periodically revised.
3. Entering information about the acquired item into internal records and (with the appropriate integration) into GIIS DMDK as registering it into inventory.

4. Pawnshop: Pledge, Default, and Sale#

A pledge in itself is not a sale: it is a loan secured by the client's property. This leads to different cash register operations at different stages:

The sale of unredeemed collateral is a full-fledged sale to a third party or through the pawnshop's own showcase, and it is subject to the same marking/UIN tracking requirements as any other jewelry sale, provided it is registered in GIIS DMDK.

5. Item Exchange with Additional Payment#

There are two working approaches; the choice between them is usually dictated by the capabilities of the inventory management software:

1. Two separate receipts. A return receipt for the old item (its full cost) plus a new sale receipt for the new item (its full cost) — the customer physically receives the refund for the old item and immediately pays for the new one, with the difference visible across two payments.
2. Trade-in offset with additional payment. A single receipt for the new item, where the value of the old item is accounted for as part of the payment (similar to a trade-in), and only the additional payment is processed as a POS payment method on a separate line. This option requires the inventory system to correctly process both the write-off of the old UIN and the registration of the new one.

Both approaches complete the transaction correctly from a POS perspective — the choice depends on what is easier for accounting to reconcile and what the specific software supports.

6. Hallmarks and Assaying#

Metal assaying and applying a hallmark is a separate procedure that takes place before the item enters retail sale and is unrelated to POS operation: the POS sees a finished item with a known fineness grade in the product card. Hallmarking and assaying matters are resolved with the local assay supervision office, not through POS or jewelry inventory software.

7. Example#

A customer brings an old ring to exchange for a new chain with an additional payment. The store uses a trade-in offset approach: a single receipt is generated for the chain, the value of the ring is credited as partial payment, and the remaining difference is processed as a separate payment line (for example, by card). The UIN of the old ring is recorded as an item accepted onto the balance sheet, while the UIN of the chain is recorded as sold; both actions are logged in inventory management and submitted to GIIS DMDK according to the specific software integration.

8. How to Do This in Cenaly#

• Scanning an item tag/code at the POS register is performed via Cenaly Hardware Bridge — the POS compiles the receipt using the item card from the catalog in the same way as for any other unit item.
• Cenaly does not offer an out-of-the-box integration with GIIS DMDK: Cenaly is responsible for the checkout layer (receipt, payment, discounts), whereas submitting data on UIN removal/registration and working directly with the system is managed by specialized jewelry software or the GIIS DMDK personal dashboard — check with your inventory software provider on how the connection is structured.
• Non-standard operations — trade-in exchange with an additional payment, sale return upon rejecting an old item — are processed as regular checkout corrections; read more about non-typical cases in the article on complex refunds.

9. Frequently Asked Questions#

Is it mandatory for a jewelry store to use dedicated software for GIIS DMDK? Formally, what matters is not the specific software, but the actual correct submission of data to the system. In practice, this is handled either by specialized jewelry inventory software or directly through the GIIS DMDK user account — a standard POS terminal without such an integration is not designed for this.

Is it mandatory to print the UIN on the receipt? The required receipt details for jewelry items depend on the applicable FFD (Fiscal Data Format) and the settings of your POS/inventory software — check with the GIIS DMDK operator or your software developer to see which specific fields are mandatory in your case.

What purchase/buyout amounts require additional identification under anti-money laundering regulations? The thresholds are periodically revised — verify with the current version of the relevant law and do not rely on figures from outdated manuals.

Can a return receipt be processed for jewelry if the customer simply changed their mind at home? Yes, jewelry is not included in the standard list of non-returnable goods, unlike, for example, medicines — but specific return conditions (preserving the tag, UIN, re-saleable condition) should be specified in the store's internal policies.

Related articles: complex returns · marking at POS · fines and liability

The material is for informational purposes only and does not replace legal advice or consultation with an expert on accounting for precious metals and stones. Primary sources: Federal Law No. 54-FZ "On the Use of Cash Register Equipment", legislation on state regulation of relations in the field of extraction, production, and use of precious metals and stones, anti-money laundering legislation (Federal Law No. 115-FZ), and GIIS DMDK rules.