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Inventories, Net - Schedule of Inventories, Net (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | --- | ---
Inventory [Line Items] |  |  |  |
Allowance for inventory obsolescence | $ (260) | $ (242) | $ (169) | $ (145)
Total inventories, net | 24,743 | 13,559 |  |
Loose diamonds |  |  |  |
Inventory [Line Items] |  |  |  |
Inventory, gross | 9,013 | 4,938 |  |
Fine jewelry and other |  |  |  |
Inventory [Line Items] |  |  |  |
Inventory, gross | $ 15,990 | $ 8,863 |  |

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