Such a cute dish for your special crystals, or burning a pillar candle. What I like this dish for is when I feel like my specific signs need some love. For instance, my sun is in Leo so I use amethyst to calm my fire and help me channel it in areas I need it. So I put a tumbled piece on the Leo symbol. Then my moon is in Libra, so I like to put a piece of lapis on Libra's symbol to help me use my voice clearly.
But I recommend you get creative with this dish, it truly is beautiful.