The Vintage GIA GEM Duplex II Refractometer Model 392000 is a high-quality gemological testing tool suitable for jewelry making and identification. Made from glass, chrome, and plastic in a gray and black color scheme, this refractometer unit comes with a removable eyepiece magnifier lens and a dust cover for easy use and protection. Manufactured in the United States by Gia Gem, this product is a must-have for professionals in the jewelry industry looking to ensure the authenticity and quality of gemstones.

Vintage GIA GEM Duplex II Refractometer Model 392000 Gemological Testing R35.

Up for sale is an authentic, professional-grade bench tool from the Gemological Institute of America (GIA):

The GIA GEM Duplex II Refractometer. This desk-model instrument is highly prized by gemologists, appraisers, and students alike for its exceptional accuracy in identifying gemstones by measuring their refractive index (R.I.).

It is specifically engineered to "spot" read cabochons or small facets with diameters under 1mm.

The housing features a sharp, legible reference chart showing expected R.I. and birefringence values for common gemstones like Zircon, Tourmaline, Jadeite, and Spinel.

Condition: Pre-owned in solid working condition.

The outer white casing remains intact with typical cosmetic signs of use commensurate with age.

The text chart is fully readable. Please check the photos carefully for exact physical condition. Hemicylinder glass is clean and functional.

What’s Included:

GIA Duplex II Refractometer Unit. Removable Eyepiece Magnifier Lens (attached)

Clear protective dust cover.

Secure shipping! Please get in touch with me if you have any questions or would like additional photos.