10X18 with 20X12 Loupe (both triplets) More sophisticated diamond gauges as will some spinel

as will some spinel

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

so this weighs down to the nearest 5 points)

UK power supply for mains operation

it works on nickel providing the nickel hasn't be processed with a coating

10X18 with 20X12 Loupe (both triplets) More sophisticated diamond gauges as will some spinelSummary 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