You would need a jeweller's loupe the size of the Sun to grade this diamond.

Each usually comes with a diagram, marking the position of the tiny specks of carbon that can be seen when viewed through a "loupe", the jeweller's 10x magnification tool.

Pressing the glass to his eyelike a jeweler, Leeuwenhoek watched his own animalcules swim about, lashingtheir long tails.