Is there any particular Refractormeter that is better for Gemstone Identification?

Answer 1

I'm using an old GIA Refractometer from the eighties. They don't make them like they used to! It is in very good condition although the lead glass could do with some polishing. The scale is slightly off, but I make do by adjusting my readings accordingly.

I think most refractometers out on the market are equally good as long as you perfect your technique of viewing the shadow edges, and also keep them well maintained. For instance, clean the lens carefully and coat it with some petroleum jelly to prevent oxidation before storing it up.