Opal: Opal is one of the rarest and most precious emeralds.

Tiger eye stone: one of the seasonal varieties.

2. Different distribution

Opal: Sri Lanka

Tiger Eye Stone: Brazil, China, Henan and other places.

Extended data:

Project introduction:

Opal is a kind of chrysoberyl in mineralogy and belongs to the chrysoberyl family. Gold emerald is an alumina containing beryllium, and its chemical molecular formula is BeAl2O4. It belongs to orthorhombic system. Crystal morphology is often short columnar or plate-shaped.

Strictly speaking, "cat's eye" is not the name of a gem, but an optical phenomenon presented on some gems.

That is, when a semi-spherical gem is irradiated by strong light, a narrow and bright reflection will appear on the surface, which is called "cat's eye flash" or "cat's eye live light", and then it will be named according to what the gem is. If the gem is in season, it will be called "quartz cat's eye", and if it is golden emerald, it will be called "golden green cat's eye".

There are many kinds of gems that may have a cat's eye flash. According to statistics, there may be as many as 30 kinds. In addition to quartz cat's eyes and golden green cat's eyes, there are mainly "pyroxene cat's eyes" and "aquamarine cat's eyes" on the market. Because the golden-green cat's eye is the most famous and precious, it is also called "cat's eye" for short, and other cat's eyes can't be called that.

Baidu encyclopedia-opal

Baidu Encyclopedia-Tiger Eye Stone