The ring is nice, as the seller stated, the engraving on the stone was done with a laser, but in reality there is nothing there; I didn't find anything. . . I don't have a tester either, unfortunately. The certificate is checked by the serial number. When illuminated, the stone slightly sparkles. The sun isn't here yet; I'll check tomorrow afternoon. It's not that big; it's hard to handle in gloves. A 5-carat stone would probably be suitable for gloves, but it wouldn't have that effect. . . To me, it's just a glass piece and nothing special; it's not made with high quality. We'll have to see what happens to it in a couple of months. . . . It will suit 20-year-old girls.