Are Sardonyx and Carnelian the Same?

As mentioned, sard is a variety of chalcedony quartz, and so is carnelian. However, the two are not the same exact stone. The main difference here is the color, as carnelian is orange and sard is a deep reddish-brown.

What stone is similar to carnelian?

Similar to carnelian is sard, which is generally harder and darker (the difference is not rigidly defined, and the two names are often used interchangeably). Both carnelian and sard are varieties of the silica mineral chalcedony colored by impurities of iron oxide.

Is there another name for sardonyx?

Sardonyx Geological Properties

Onyx, although thought by most to only appear in black, can appear in almost any color. These two types of the mineral chalcedony are paired in bands to create sardonyx. Also known as Sardian Onyx, it may be clearly banded or have a less defined mix of colors.