Diamond Colour Shade Card Lamps & Lightings the Johari Dial Gauge ensures

the Johari Dial Gauge ensures accurate measurements up to 20mm with an industry-leading precision of 0

and various other gemstone types

minimizing any chance of errors during measurement

This ring shaped stone holder is made of very strong material to hold any type of loose stones in its strong hold grip of claw or prongs

Just Place your stone on its lower fixed plate by sliding down its vertical bar and just let it slide back to the top

Diamond Colour Shade Card Lamps & Lightings the Johari Dial Gauge ensuresPerfect white paper cards provide the ideal neutral white background for colour grading diamonds & comparison. Available in a pack of 10 pcs.