Java Edition:Stone (Item)
The stone item was discontinued during many Classic and Indev versions. The stone item was recontinued in Indev 20100223 when the cobblestone smelting recipe was added and it has been obtainable ever since.
Obtaining
Mining
Items (besides the earlier unsaved items in the hotbar) were first added in Classic 0.24_SURVIVAL_TEST. The world begins to save in Classic 0.25 SURVIVAL TEST (Classic 0.25_05 SURVIVAL TEST is the first archived version after Classic 0.25 SURVIVAL TEST, which is lost). The hotbar and item entities begin to save then. Originally, the stone block dropped itself (this made cobblestone unobtainable). In Classic 0.26 SURVIVAL TEST, stone was changed to drop cobblestone when mined instead, making the stone item unobtainable.
Late Creative Classic Inventory
From Classic 0.28 (Classic 0.28_01 is the first archived version after Classic 0.28, which is lost) to Classic 0.29_02 and in Classic 0.30-c, the stone item is obtainable by grabbing it from the creative inventory which will save it in the player's hotbar.
Indev Chest
From Indev 0.31 20100124-2119 to Indev 0.31 20100128, the stone item could be found in the Indev Item Chests. This was the last time that the stone item was obtainable until the cobblestone smelting recipe was added in Indev 20100223, which continues to work up to 1.21.6 Release Candidate 1 (present).