Lab diamond and moissanite are both valuable by nature. The main difference between them is that lab diamond is mined, whereas moissanite is created in a laboratory. Lab Diamonds are a natural gem, mined from the earth and made into a form or shape that is practically identical to the original mineral. Moissanite is a synthetic version of diamond, and it has been engineered not to dull over time like mined diamonds. The lab diamond vs moissanite is a question that you should ask yourself before buying a ring