Refractometer

Bausch & Lomb Abbe Refractometer in original wooden case in working condition. A refractometer measures the ability of a liquid to bend (refract) light passing through it, which is related to how much

A Dipping Refractometer by Bausch and Lomb, Mid-20th Century. Reading 0.00003-0.00004 refractive index units. Having four auxiliary prisms (1.32-1.36, 1.36-1.40, 1.39-1.43, 1.43-1.47), beaker and two

HILGER MICRO-OPTIC REFRACTOMETER, CA 1950 APPROXIMATELY 16 IN X 91 IN X 21 IN H

REICHERT ABBE MARK II REFRACTOMETER

* A Group of Four Refractometers carl zeiss and others, 20th century comprising a cased example and three others. Height of cased example 11 1/2 inches. Estimate $ 40-60 Property from the Collection o

Platinum Elegant Diamond, Earrings Measuring 1.18" in length, featuring a pear cut light blue center stone (the refractometer indicates that the stones are synthetic and have a refractive index of app

Including a Duplex Refractometer, a Presidium Dial Guage, A Microscope Base, A Spectroscope, Plus

GIA Gem Fiberlite Testing Equipment includes: Duplex II Refractometer, Polariscope Model 415, Pleochroism (color variation) Model 409; Fiber Lite Model 413, Specific gravity, etc testing fluid kit, le

Tests as a tourmaline on the presidium gem tester ii. Under refractometer it shows as approximately 1.6, single refraction. 7/8" long, 1/2" wide, 1/2" tall.

Vintage carved male face. Stone reads at 1.68 on refractometer, Jadeite? Measures 1" x 3/4" x 1/2" high. From the collection of Louis Rauch who was the head designer at "Le Petie Musee" in New York be

Pieces: 1 Shape: Emerald Facet [Stone is a roughly cut and so surface imperfections, called naturals, were left to retain carat weight] Type: Baddeleyite (Tested via digital refractometer RI of 2.165)

Group lot of gemological tools from Gem Instruments, Santa Monica USA. Including one Duplex II Refractometer in white and black with refractive index charts along the sides, with dust cover and origin

A collection of gemmology reference books and a refractometer including reference books on Quartz, Amber, Garnet, Beryl and Jet from the Butterworth Gem Books series; 'Corundum' by Richard W Hughes &

A collection of gemmology reference books and a refractometer including reference books on Quartz, Amber, Garnet, Beryl and Jet from the Butterworth Gem Books series; 'Corundum' by Richard W Hughes &

German, c.1960, engraved 'Carl Zeiss 4366377 Gemany' with 2 prisms marked 1.3 - 1.7 & 1.6 - 2.0, in fitted case with original instructions

Optical Refractometer made by Carl Zeiss Jena (then East Germany). Has seen heavy use, needs cleaning, and is probably best suited for historical display. Even so, all the necessary parts for it to fu

GIA Gem Instruments Duplex II Refractometer. Dust cover included. Good condition. Measures 4-1/4" H. Shipping $58.00 (estimate $100-$200)

A BOXED ADAM HILGER LTD OF LONDON REFRACTOMETER together with a boxed Prior microscope. (2)

Antique Bellingham & Stanley Ltd refractometer in a wooden case, London, serial number: 449717. Made of brass, enameled in black. Height: 31 cm. Very heavy (approx. 5 kg). Slight wear to enamel coatin

GIA refractometer in case, 1.3-1.85. 3 mineral booklets, gems and gemology 1974-76, The Science of Gems by Fisher, Faceting for Amateurs by Vargas. GIA notebook binders with printed course material-19

G RODENSTOCK EYE REFRACTOMETER CA 1960, APPROXIMATELY 18 IN X 10 IN X 18 IN

Bellingham & Stanley Ltd refractometer in a case together with a Barnet binocular microscope cased with eye pieces.

By Hilger in its original case

2 Refractometers 1) R. Fuess, Steglitz near Berlin, c. 1910, with slit for polarisation, original lacquered brass, heavy tripod with one adjusting screw, height 11 ¾ in. - And: 2) Dr. Carl Leiss,