Ok I see the pictures now. On backlight it shows translucency, which would rule out jasper which is opaque. Though no certain determination can be made without physical tests, from a visual identification it looks most like carnelian with black internal inclusions. For the possibility of it being amber, this can be easily determined by hardness. Try scratching it with a knife. If the knife scratches, then it is too soft to be carnelian and amber would be a viable possibility. If it doesn't scratch it, its most likely carnelian.