* There is a saying in the jewelry store that natural gemstones are "ten Hong Jiu cracks", and natural rubies without flaws and cracks are extremely rare. Natural rubies are very precious, and there are few rubies over 8 carats on the market. However, there are few internal defects and crystal inclusions in artificial rubies, which are clean and large.

Secondly, natural ruby has a strong "dichroism", that is, it presents red and orange-red colors from different directions. If there is only one color, it may be red spinel, garnet or red glass.

In particular, red spinel is very similar to natural ruby, which is very easy to be confused and should be identified from many aspects.

(2) Identification of sapphire

* Natural sapphires are often uneven in color, and most of them grow in a straight line, while artificial sapphires are even in color. The growth line is an arc-shaped belt, and bread crumbs or beaded bubbles are often seen in the body.

* Secondly, natural sapphires have obvious dichroism, which is blue from one direction and blue-green from the other, while other gems have different color qualities.

"Third, hardness measurement. Natural sapphires can carve traces on topaz, while other sapphires are difficult to carve traces on topaz. So when buying sapphire, you can consider carrying a topaz with you.