Some antler is dry and crumbly (Moose) some is very opaque and buffs well. I picked up antler cheap over the years and had some sort of spatulated antler that when sanded and buffed looked like a combination between ivory and tortoise shell. Really rich looking. There was a fellow I would see at Craft shows that made small boxes, pill boxes etc and rings from antler and exotic woods. Extremely fancy. Some used the natural finish of the antler and some were turned and highly polished with fancy inlays. He had a deal with several deer and elk farmers to buy antler and was fussy about what kinds he bought because he said some was unfit to work with. I have a moose antler and it is indeed chalky and crumbly. I have some caribou and fallow deer and well as White tail. It has different properties for use in places that might wear. In addition, that pithy part may need to be stabilized. There is a special stabilizer available and requires a pressurized pot to work. For small jobs some folks just let CA glue soak in and dry.