Step 4: Gem Grading
What is a Reticle?
A reticle (réttik’l) is an optical device used in conjunction with a magnifying lens. For example, the cross hairs on a gun sight are a type of reticle. Machinists use reticles with a variety of micro-rulers and micro-protractors for fine measurements. While not specifically designed for gemology, these can serve gemologists very well.
There are two types of reticles: contact and non-contact.
- Microscope eye pieces incorporate non-contact
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