Ultra violet in safe-box (longwave + shortwave + white ) Gold testing kits (complete sets - including Silver testers) You will need a sample

You will need a sample of 18ct yellow gold (it must be exactly 18ct)

Useable diameter of this lens (allowing for the rim that holds the lens in place) 18mm

If a stone is dichroic (transmits two colours at once) you will see the two distinct colours when viewed through a dichroscope

5% false negative rate) providing the colour is 'clear' (colour D to J) and the size is at least 0

letters and parcels

Ultra violet in safe-box (longwave + shortwave + white ) Gold testing kits (complete sets - including Silver testers) You will need a sampleSummary Shortwave UV light in a 'safe' box (to stop the light burning your eyes and a longwave UV light and an ordinary white light. For examining gemstones, stamps and other small objects. It can also be used for sterilising small items of jewellery to make them safe from viruses but please read the explanation first. Can be switched to UV longwave, UV shortwave, or white light. To see the reaction under these three different lights it can also be