1. Emerald: Emerald is a kind of emerald, which is famous for its green color and high rarity. The value of jadeite is mainly determined by its color, transparency, purity, cutting and size. The most precious jadeite is often dark green, with high transparency, good purity and large volume. The price of high-quality jadeite is often higher.
2. Pearl: Pearl is a precious gem secreted by shellfish. The value of pearls is influenced by their quality, shape, size, luster and color. Natural freshwater pearls and seawater pearls are very valuable. High-quality pearls are usually round or nearly round, with good luster and pure color. The value of pearls is subjective and sometimes influenced by scarcity and historical background.
3. Agate: Agate is a kind of microcrystal, which is common in various colors, such as red, orange, yellow and blue. The value of agate depends on its color, transparency and texture. Generally speaking, dark and uniform red agate and high-purity texture are more rare and precious.
4. Diamonds: Diamonds are one of the most precious gems. Its value is determined by its four C factors, namely, cutting, color, clarity (carat) and carat weight. Cutting determines the brilliance of a diamond. The higher the color and purity, the more precious the diamond is. In addition, big diamonds are often rarer and more expensive than small diamonds.
To sum up, there is no absolute conclusion about the value of these gems. The value of each gem depends on many factors, including characteristics, quality, supply and demand and market preference. I suggest that when you buy gems, you should carefully study and evaluate the characteristics of gems, choose the gems you admire and love, and find a reliable jeweler to buy them.