Both emeralds and aquamarine belong to the beryl gemstones. They have the same physical structure and very different chemical compositions. However, due to their growth in different geological environments, their characteristics are quite different: emeralds are called It is the "king of emeralds". It grows in metamorphic rocks. The ore-forming conditions are more complicated and varied, so most of them are "small and exquisite", and there are very few emeralds larger than 2 carats. The emerald color is beautiful, but it contains many impurities and a small gap with fog. Hailanbao is only a mid-range gem. It grows in pegmatite. The environment is closed and stable. The crystals are generally large. The largest is 16 kilograms. The interior is very pure, with less inclusions and blue like sea water. The most confusing with emerald is the synthetic yttrium aluminum garnet, which is also green, with very pure interior and strong surface gloss. It is often reddish under strong incandescent light. In contrast, natural emeralds, the surface is not very bright, and there is not much redness under strong incandescent lamps. The main imitation of Hainan gemstone is blue topaz. Most of the aquamarine currently sold in the market is produced by Altai, Xinjiang. It is light blue or blue-green. Some of them can be seen in a thin tubular wrap under a magnifying glass. Blue topaz is artificially changed from colorless topaz to blue, mostly dark and sometimes uneven. The interior of the blue topaz is generally very pure. Although it is natural to the stone of aquamarine, the price of blue topaz is only about 1/4--1/8 of the sea sapphire. Snapback Caps,Snapback Hats,Snapback Dad Hats,Printed Snapback Caps Henan J&F Headwear Group , https://www.jianfengcap.com