TenderScope (S-305)

As a professional buyers, you are apprehensive about diamond characteristic, whenever going for purchase the diamond in auction or in tender, where most of them have some inclusion or imperfection. When decision are to be made promptly, At that time you must have the ability to make considered decisions on the beginning with your experience only. With TenderScope you can see these inclusion very quickly with in the diamond auction or tender. It is an exceptional tool, compact with very light weight, which is easily carrying from one place to another.

TenderScope is especially design to check the clarity of parcel of rough and polished diamonds at any place without worrying the complete conventional set-up. Moreover, TenderScope loaded with worlds best stereo optics made by “Zeiss-Germany” Stemi-305/508. It’s module base aluminium structure allow you to easy assembling and dismantling of it. TenderScope is an ideal tool to help you, to make the right decision on site!


The Solitaire Microscope base is equipped with a advance illumination system that consists of a unique combinations of halogen or LED dark-field lighting or Halogen & LED combine dark-field lighting with Overhead a day light fluorescent lamp or daylight LED. Moreover, for fluorescence quality check additional Gooseneck spot UV-LED light available.

Dark field halogen illumination

Dark field microscopy is a very simple yet effective technique to study the inside characteristics of the diamond. A set of mirrors converges the light from all sides into the centre of the stone. It works by illuminating the diamond with light that will not be collected by the objective lens, and thus will not form part of the image. This produces the classic appearance of a dark, almost black, background with bright objects on it and it’s well suited for uses for examination of Diamonds

LED illumination

LED (Light Emitting Diode) segmental ring light for shadow free ring illumination and oblique light segment illumination. Only LED gives more and a brighter white light to the diamond. Operator can choose LED illumination, which replace halogen with LEDs or in combination of both can offer you the same and extended examination possibilities.


Created for Diamond Application

From compact stands to flexible and stable boom stands, from basic transmitted light to polarisation contrast. Whether your object needs special illumination or simply the brightest light, you have various light guides to choose from. Position your specimen precisely by adding a gliding, tilting or rotating polarisation stage.

Diamond Holder

It’s vacuum based gem holder, consist suction pad, lead with tube and the vacuum pump which is an integrated design of the microscope. It allows users to hold and move diamond in all possible direction with out the view being obstructed. Moreover, conventional magnetic wire/plan type tweezer is also available.


Stemi 305

Stemi 305 is your compact stereo microscope with a 5:1 zoom. Stemi 305 lets you observe samples as they really are: three-dimensional and crisp in contrast – no preparation needed. Enjoy all the advantages of an easy-to-use microscope with integrated LED illumination for reflected and transmitted light. This Greenough microscope will give you crisp 3D impressions, versatile object illumination and easily acquired images to share, whenever you want.

With Stemi 508 you can observe Diamond & GemStone with sharp in focus and free from distortion or colour fringes. Optic is available in binocular and trinocular format. With a trinocular type, the third lens hole can be connected to a digital camera, allowing you to make pictures of your stones.

Technical Specification

General Information

Operation concept Stereo microscope, Greenough design with 5:1 zoom range
Main Component Lens Body, Stand and Illumination
Lens Body Stemi 305 (binocular, incl. eyepieces 10×/23 Br. foc), Stemi 305 doc (phototube, incl. eyepieces 10×/23 Br. foc,)
Stands Ergonomic design with adjustable in height and inclination for longer use
Illumination Three Options are available, which are Dark-field, Bright field and oblique light Illumination
Input Power Supply 100 - 240 Volt AC, 60/50 Hz
Optical Data of the Basic and Optional System
Magnification range 8× to 40x with basic version (10× eyepieces, no front optics) all magnifications from 4× to 200× (interchangeable optics)
Maximum resolution 200 Lp/mm basic version; up to 400 Lp/mm with interchangeable optics
Maximum object field 29 mm basic version; up to 58 mm using interchangeable
Working distance 110 mm basic version; up to 185 mm using interchangeable optics
Body Light weighted aluminium body
Focusing Manual coarse adjustment with Tilting arm
Reflected Illumination Double arm gooseneck – enhanced contrast of 3D shaped objects through distinct shadow effects.
Transmitted Illumination Oblique – Observe uncolored transparent objects in relief contrast
Polarization Add-On Polarization filters for ringlights, spots and transmitted light units. Study birefringent objects, detect stress in Rough and Polished Diamonds