Gemmological Instruments

Assists stone sorting and gem identification. Includes instructions and guide notes.

The Chelsea Filter (emerald filter) is a pocket-sized colour filter.
It is used primarily to spot fakes mixed in with natural stones in coloured stone parcels and
jewellery, and to differentiate emeralds, sapphires, aquamarines and
natural green jadeite from manufactured stones.

• Size Length with lense open 85mm and closed 55mm
• Width 30mm
• Thickness 12mm
• Diameter of filter 21mm
• Material Plastic white
• Weight 16grms

Some Familiar Reactions under the Chelsea Filter:
Synthetic Emerald (Cr) - Red
Blue Glass (Co) - Red
Synthetic Blue Spinel (Co) - Red
Synthetic Blue Quartz (Co) - Pink
Natural Aquamarine (Fe) - Green
Natural Zircon (Blue) - Green
Dyed Green Chalcedony - Red to Orange Red
Dyed Blue Chalcedony - Red to Pink
Natural Emerald (Cr/V/Fe) - Pink to Red / Green to Yellow Green
Dermatoid Garnet - Reddish
Blue Topaz - Blue Green

For pure transparent (non opaque) stones. Each type of stone has its own spectrum colour diagnostic. Simular to the prism spectroscope but works by diffracting white light to give non prismatic perspective.

Light enters through a narrow slit and is then diffracted by a thin film of diffraction grating material. This produces a linear spectrum image with a generally larger view of the red part than a prism spectroscope.

The spectroscope is a small and handy instrument that can be very quick to use.
It may be used to test transparent gem materials including rough and broken
pieces, fashioned pieces, strings of beads, gems set in jewellery, ornaments and carvings.
The spectrum of visible light, from red to violet can be viewed by observing
pure white light through a spectroscope.
Some gem materials modify this white light in a way which can aid identification.
• Size length 55mm
• Diameter of body 13mm
• Diameter of lens 5mm
• Finish stainless steel body.
• Top & bottom black plastic viewers
• Weight 14grms
• With leather case

Hearts & Arrows Loupe with double round base for small and large stones.
For checking the ideal cut of diamonds.

When viewed through this loupe an ideal cut stone will show a symmetrical pattern
of hearts and the table side a pattern of arrows.

This instrument is a great sales aid for anyone who sells loose diamonds.
By simply looking through this hearts and arrows loupe, your customers will be
able to appreciate the perfectly cut diamond.

Info: This unit comes with two coloured filters, red and blue for different
effects and two holding plates in a wooden base, one plate is to view the top
of the stone table and the other is to view the culet (the pointed bottom).

Only if the stone has the desirable 'brilliant cut' can the 'hearts and arrows' be seen,
demonstrating to you and your customer the quality of the cut.

• Size: Wooden base length 150mm
• Width 65mm
• Height 15.5mm
• Diameter of black holding discs 50mm
• Thickness 5.5mm
• Height of viewing loupe 95mm
• Diameter of viewing loupe 50mm
• Light weight aluminium construction

Incorporates two polarizing sheets mounted at right angles to each other allowing the London Dichroscope necessity to samples rays from two different areas of the same stone.

Examples are views of a Tourmaline/ruby gemstone with a London Dichroscope with a back light. With the same ray of light entering the gemstone both sides should be the same colour under the filter.

This is a small pocket-sized instrument used for transparent coloured gemstones to differentiate genuine stones of the same colour from synthetics.
It is one of the most useful instruments for anyone buying coloured gemstones.
It is a quick and easy way to separate stones such as sapphire-blue colour synthetic spinel from genuine sapphire, or such sapphire-blue colour synthetic spinel from genuine sapphire, or for separating green garnet from chrome tourmaline or emerald.

However, it will not separate natural gemstones from their synthetic counterparts (synthetic emeralds from natural emeralds or synthetic sapphire from natural sapphire).
It will enable you to easily separate single-refracting coloured gemstones from those that are double-refracting, and thus make many important distinctions among look-alike and imitations.
Another important benefit is that it can be used with gemstones that have not been cut or polished.
It is also very useful in cases where cut stones have such a low polish that other instruments (such as refractometers can not be used) or for jewellery pieces in which stones have been set in a way that prohibits the use of other instruments.

• Size Length with lense open 85mm and closed 55mm
• Width 30mm
• Thickness 12mm
• Diameter of filter 21mm
• Material Plastic Black
• Weight 16grms

Used to test less pure transparent (opaque) gem materials including rough and broken pieces, fashioned pieces, strings of beads, gems set in jewellery, ornaments and carvings.

Prism spectroscope (based on dispersion) is a tool for examining which parts of white light are absorbed by a gemstone (as well as by other materials).

The light enters through a narrow slit and is then dispersed through a series of prisms. Because prism spectroscopes are based on dispersion, the blue area of the spectrum is more spread out and the red parts are more condensed than the diffraction grating types.

Materials can absorb parts of the electromagnetic spectrum, and when the absorbed parts fall within the visible range that absorbed part will influence the colour of the material.

When a gemstone is observed with a Prism spectroscope, the absorbed parts show as dark lines and/or bands in the spectroscope image.

Separates perceived white light into its spectral colours to aid gem stone identification and authenticity check, includes guide notes on usage.

The spectroscope is a small and handy instrument that can be very quick to use.
The spectrum of visible light, from red to violet can be viewed by observing pure white light through a spectroscope.
Some gem materials modify this white light in a way which can aid identification

• Size length 55mm
• Diameter of body 15.5mm
• Diameter of lens top 9mm bottom 5mm
• Finish stainless steel body.
• Top & bottom black plastic viewers
• Weight 26grms
• With plastic storage case

Used to test less pure transparent (opaque) gem materials including rough and broken pieces, fashioned pieces, strings of beads, gems set in jewellery, ornaments and carvings.

The focus option allows you to focus the lines better.

Prism spectroscope (based on dispersion) is a tool for examining which parts of white light are absorbed by a gemstone (as well as by other materials).

The light enters through a narrow slit and is then dispersed through a series of prisms. Because prism spectroscopes are based on dispersion, the blue area of the spectrum is more spread out and the red parts are more condensed than the diffraction grating types.

Materials can absorb parts of the electromagnetic spectrum, and when the absorbed parts fall within the visible range that absorbed part will influence the colour of the material.

When a gemstone is observed with a Prism spectroscope, the absorbed parts show as dark lines and/or bands in the spectroscope image.

How does it work…?
Elements within a gemstone will absorb certain levels of energy. Light is energy. Therefore certain elements in a gemstone will absorb certain colours of light based on what energy level they are absorbing.
The Prism Spectroscope allows us to see which colour of light, or energy is being absorbed; thereby allowing us to know what elements are in a gemstone.
This, in turn, allows us to know more about the gemstone, for example...identification, where it came from, what causes it to have colour, etc....

When looking through a spectroscope you will see lines or bands missing from the colours. This is where elements within the stone have absorbed that level of energy or light, letting us know that the element exists within the stone.

Features:
• Adjustable focus and slit.
• Black shell to avoid reflective light disturbance.
• Size: 85mm x 20mm
• Diameter of lens top -7mm bottom - 10mm

Weight: 45g

The creator of the Shindler Loupe, Bernard Shindler developed an inventive solution to a problem in the jeweller’s trade that had never been satisfactorily solved. Shindler created the unique and very popular "Shindler Scale" which embodies specially graduated scales in a magnifier and thus enables the likely weights to be read off quite straightforwardly, even while the stones are still mounted.

Bernard Shindler enjoyed a long career in the diamond trade, which he much loved and in which he had many years of experience in inspecting and valuing precious stones (mostly in preparation for mounting in jewellers items). Combined with many years experience in precision engineering, his insight changed the way jewellers work and estimate precious stones.



• Only one of its kind and extremely useful, the Shindler Loupe lets you estimate a stone's weight, even if it is still mounted.
• It is an especially valuable tool for jewellers needing to estimate a stone that is still mounted in a piece of jewellery i.e. bracelet or ring. Naturally, it is also ideal for estimating loose stones.
• Easy to use, it features a center scale that doubles as a 6.5mm gauge to evaluate a stone's weight and size up to 1ct. Simply place the stone face down on the inside of the replaceable 2.5cm clear tape protected screen.
• Magnification 10x linear (virtual image measured at standard 25 cm.)
• Dimensions (LxWxH) - closed 3.6 x 2.2 x 1.2 cm - open 3.6 x 2.2 x 3.3 cm
• Weight 30g.
• Base Opening: 14 mm square