A .22 can weigh less than 1.5 grams. But it is ridiculous regardless to compare weight of a ring to something most people don't really know the weight of and that something that seems light as is.
In the US, a bullet's notional size and weight is perhaps more familiar than grams (or any metric unit, really). In any case, I sense there was a subtle pun in that its cost is liable to kill the financial livelihood of most.