Buying jewelry online is because things on the Internet are mixed and fakes are rampant. It is really not easy to identify the authenticity of jewelry, but this barrier still exists.
Jewelry other than diamonds, gold and silver is relatively unreliable to buy online. It is best to buy online in a physical store, and it is more secure if a professional helps you check it. Especially some jade, precious stones, opal, beeswax and so on. The water is really too deep, people who don't understand shouldn't touch it easily.