10X18 with 20X12 Loupe (both triplets) More sophisticated diamond gauges Power: 2 AAA batteries or

Power: 2 AAA batteries or USB (cable supplied)

UK power supply for mains operation

) but knowing that a stone isn't a diamond is an essential part of a diamond tester

A refractometer measures refraction (bending) of light as it passes through the gemstone (like poking a stick into clear water)

10X18 with 20X12 Loupe (both triplets) More sophisticated diamond gauges Power: 2 AAA batteries orSummary A 10X magnification lens folds out from on end (18mm diameter); 20X from the other end (12mm diameter). Too see reviews of loupes, click here and then scroll down to see the difference between this and an identical looking loupe at a fifth the price. Detail A 10X magnification lens folds out from on end (18mm diameter); 20X from the other end (12mm diameter). Best quality. I always say that a good quality 10X loupe is better than a 20X loupe