【Intuitive Design】Yhkj Diamond Tester Pen comes with LED lights and audio indication. During a test, if the stone tested is a diamond, the LED lights will light up as the stone passes each ...

Sometimes, it's a lost hair clip, but if luck is with them, it's a diamond ring, a piece of armor, or an ancient sword. It's ...

The experiment will measure gravitational tugs between tiny diamond crystals and determine whether gravity — like the three ...