I recently bought some crushed gemstones and have been having fun mixing them with resin...
(Left: Kyanite, Chalcedony, Crystal Quartz, Resin
Right: Amethyst, Citrine, Resin)
At first I thought I'd dome the resin to get a smooth finish (like the one on the left) but actually I think I prefer the 'craggy' look of the one on the right.....