with out modding, bedrock is invincible. there is no lave below it just the void. There is nothing there but air. it also kills you. But you can find lava around the bedrock on level 5 to 25 or so is usually a good place to look.
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one of my favourate way is to dig a 2x2 hole down to bedrock but make sure you dont take anything to valubale as you can fall in to lava quickly.
you need to dig to roughly 10 blocks above bedrock and mine the ore with a minimum iron pickaxe
Diamonds can be found from layer 15 and under, but they are very rare. (layer 1 = lowest bedrock) Depending on how high you are, you might have to dig down about 50 blocks.
If you dig down to around diamond level (0-12 blocks) and find your way into a cave, there should be an abundance of lava down in the caves. Above ground, dry/desert biomes can contain lava pools.
Around 60 to 64 blocks under, bedrock is a sign to not dig any deeper otherwise you will enter the void and entering the void kills you. People believe that the void is the nether because if you dig up in the nether, you will see bedrock like in the real world when you dig down.