1. Ruby, ruby is very rare and mainly exists in rubies, spinels and garnets. Some very good red tourmalines are also comparable to rubies in color. Common red gems are as follows:

Ruby, spinel, garnet.

2. Sapphire, the color is related to the oxide content of iron and titanium. Brilliant blue and sky blue are the top grades, and cornflower blue is the best.

3. diamonds

4. Emerald

5. Opal

Other gems: tourmaline, tanzanite, spinel, saffron, garnet, Morganite, aquamarine, turquoise, lapis lazuli, topaz, opal, prehnite, olivine, moonstone, Tianhe stone, crystal, agate, apatite, ruby, etc.

Aquamarine:

Olivine:

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