1, carnelian is a kind of jade with high purity, which usually presents crimson, pink, orange and other colors. Its hardness is as high as 7.5 to 8, which is relatively wear-resistant and can be used to make jewelry.

2. Ruby is a gem-grade gem, showing bright red to dark red. Its hardness is as high as 9, which is very hard and suitable for making high-grade jewelry.

3. Red iron ore is an iron-bearing mineral, usually dark red to bright red. Its hardness is as high as 5.5 to 6.5, which is relatively hard and can be used as an ornament.