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Inventories, Net - Schedule of Inventories, Net (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | --- | --- | ---
Inventory [Line Items] |  |  |  |
Allowance for inventory obsolescence | $ (356) | $ (307) | $ (279) | $ (260)
Total inventories, net | 37,256 | 39,331 |  |
Loose diamonds |  |  |  |
Inventory [Line Items] |  |  |  |
Inventory, gross | 8,986 | 11,894 |  |
Fine jewelry and other |  |  |  |
Inventory [Line Items] |  |  |  |
Inventory, gross | $ 28,626 | $ 27,744 |  |

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