IDC clarity grading is by examination using a 10x achromatic, aplanatic loupe in normal light. The inclusions in natural stones are easily seen with a jeweler's loupe. Many doubled die errors require at least a jeweler's loupe to be seen. The first GIA instrument, a 10x eye loupe, was introduced in the early 1930s. These can be viewed under proper lighting conditions with a diamond loupe. All diamonds are examined under a loupe to determine their clarity. As with all diamonds, the loupe standard is used to grade clarity. In such positions, the natural is not visible even with a loupe. Loupe was born in Baton Rouge, Louisiana, where he attended Episcopal High School. The ribbon is attached to a loupe hole on the top of the medal. The space reopened in August 2018 as the Loupe, an indoor observation deck. Place and date&colon; At Loupe Fork, Platte River, Nebr., April 26, 1872.