MCItemEntity

It might be required for you to import the package if you encounter any issues (like casting an Array), so better be safe than sorry and add the import at the very top of the file.

ZenScript
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import crafttweaker.api.entity.MCItemEntity;

MCItemEntity extends MCEntity. That means all methods available in MCEntity are also available in MCItemEntity

ZenScript
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new MCItemEntity(world as MCWorld, x as double, y as double, z as double, stack as ItemStack) as MCItemEntity

ZenScript
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// MCItemEntity.getItem() as IItemStack

itemEntity.getItem();

ZenScript
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// MCItemEntity.setItem(stack as IItemStack) as void

itemEntity.setItem(<item:minecraft:diamond>);