Jeweler's loupe and microscope

A jewel is examined up close. The jeweler's loupe (10x) is the basic tool for seeing inclusions, prongs and hallmarks.

10x loupe #

It is the standard for grading diamonds. It is held against the eye and the stone is brought close until in focus.

Microscope #

With more magnification and adjustable lighting, it lets you see inclusions and work with precision (in setting and engraving).

Visor and head loupes #

They leave the hands free to work.

Care #

Clean the lenses with a microfiber cloth and avoid touching them with your fingers.

How to use the 10x loupe #

Hold the loupe against the eye and bring the stone (or both toward the face) until it is in focus. Rest your elbows against your body so as not to shake and look under white, diffuse light. Look for inclusions, scratches, chipped edges and worn prongs.

What is examined #

• Stones: inclusions, color, symmetry and damage at the girdle.
• Metal: hallmarks and stamps (hallmarks).
• Solder joints: whether there are pores or lines.
• Settings: whether the prongs hold well.

Magnification #

10x is the standard for grading diamonds (the 4Cs). With more magnification the field and depth of focus decrease, so a microscope is used.

Care #

Clean the lenses with a microfiber cloth, keep it in its case and avoid touching the glass.

See also #

• The 4Cs of diamonds: cut, color, clarity and carat
• Jeweler's scale and caliper
• Jeweler's bench and bench pin