5.13ct Oval Cabochon Black Opal 15.7x77.7mm Bergeon 16200R Bushing Tool Reduced Set Three modes are optional: it

Three modes are optional: it can be used to detect wood and metal stud

Suitable for domestic freezer

Medical observation: medicine observation

32℉~200℉

5.13ct Oval Cabochon Black Opal 15.7x77.7mm Bergeon 16200R Bushing Tool Reduced Set Three modes are optional: itOpal is probably the most famous phenomenal stone displaying the unparalleled play of colour, a rainbow coloured kaleidoscopic effect. The name opal derives from the word 'opalus' given by the Romans, which is Latin for 'precious stone'. They can be fragile which makes it more suitable for jewellery such as necklaces, brooches and earrings that are less likely to be knocked. Opal is the birthstone for October. Mohs Scale of Hardness: 5. 5 6. 5