Stones are like humans. We are of different shapes and sizes and even colours. Some of us are diamonds in the rough, some of us are grains of sand amongst other pebbles. Some of us may look strong, but are actually weak and crack under pressure.
Precious stones' worth are defined by humans, be it ruby or sapphire.
But a human's worth is not measurable by money. It is up to an individual to value himself or herself.