Thank you all so much for your insights, it's very informative and helpful I didn't know at all that malachite was that fragile! Now I'll save up for onyx
@Notorious Pink: you'll find below the chart that explains how 5 elements operate. The colors of your element and the element that feeds or fuels yours (according to the purple arrows) are the ones that are supposed to bring you good energy. For example, my element is Wood so Wood's color (green) and Water's color (black) are good for me.
You can find out about your element according to your birth year here (down of the page where there are 12 astrological signs and the corresponding years):
https://www.yourchineseastrology.com/five-elements.htm
Sorry for being off topic and have a nice day!