According to the traditional psychology and consumption customs of different countries (ethnic groups), ダイヤモンド, ルビー, サファイア, エメラルド, high-quality cat’s eyes, アレキサンドライト, black opals, and extra-grade jade are usually listed as high-grade gemstones. Their prices are extremely expensive, a few per carat. The prices range from thousands to tens of thousands of dollars, and the prices increase unabated, especially the extremely large treasures and historically valuable collectibles, which are even more valuable. 加えて, the colored gemstones have bright colors, 良好な透明性, certain hardness and good quality, such as golden emerald, スピネル, white opal, アメジスト, トパーズ, かんらん石, ガーネット, ベリル, アクアマリン, トルマリン, トパーズ, spodumene, アンダルサイト, tanzanite, ジルコン, ashlar, ムーンストーン, ラピスラズリ, ターコイズ, パール, ネフライト (mutton fat white jade), and commercial grade jade They are all mid-range gems. Their prices in the jewelry market are much lower than high-end gems of the same quality, generally ranging from tens to hundreds of dollars per carat. しかし, a few rare and high-quality mid-range gems can be sold for several dollars per carat. Dry dollars, such as demantoid, high-quality pearls, 等. Some gems with special optical effects (スターライト効果, 猫の目の効果) are of the same grade as their gems. Low-grade gems are generally produced in large quantities and relatively low in hardness. 例えば, 瑪瑙, カルセドニー, 結晶, シウユ, マラカイト, 蛍石, 等, have lower prices. Regarding the classification of gemstone grades, there is currently no uniform standard. The gems provided by Baolong.com are all natural, including high, middle and low grades, which are convenient for customers to customize.