It is one of the three rarest stones, and its vivid neon blue color is attractive. It was originally mined in the state of Paraiba in Brazil, but large, high-quality Paraiba is extremely rare. Therefore, Brazilian Paraiba tourmalines are very expensive, with high-quality ones costing over 1 million yen per carat. It is also mined in Africa, but most of them are pale in color and are traded at a lower price than Brazilian ones.

It is one of the three rarest stones and is characterized by its color-changing effect. It is said to be "emerald by day, ruby ​​by night" and is attractive because it is greenish in sunlight and changes to a purplish reddish color under incandescent light. It is a stone with a dark and cool impression, so it is a popular gemstone among men. It is also designated as the June birthstone and the 45th wedding anniversary stone. High-quality stones with few inclusions and a clear color change are valuable and traded at high prices.

It is one of the three rarest stones, and its gentle pink to orange color, like that of a lotus flower (padparadscha), is its charm. If the pink is too strong, it becomes pink sapphire, and if the orange is too strong, it becomes orange sapphire, so the rarity of the subtle intermediate colors makes it popular, and the price is also significantly higher.
However, the colors range from pink to orange, so choose the color that suits your taste.
Also, please be aware that some appraisal agencies will identify Padparadscha sapphires and others will not. The main production areas are Sri Lanka and Madagascar. As with rubies and sapphires, they are usually heat-treated. Unheated rubies and sapphires, which are beautiful even without this heat treatment, are in low circulation and are traded at high prices.

It was discovered in Tanzania in 1967 and named "Tanzanite" by Tiffany & Co., and quickly became popular. Tanzanite traded on the market is only mined in Tanzania. It is a stone similar to sapphire, but unlike sapphire, it appears purple depending on the angle. In addition to the purplish blue color, some stones have a pleochroic reddish hue, giving them a mysterious impression. It is also designated as the December birthstone.

Cat's eye is a gemstone with a line of light engraved on it like a cat's eye (chatoyancy effect). The chatoyancy effect can be seen in other gemstones such as alexandrite and aquamarine, but chrysoberyl cat's eye is in a class of its own. Stones with beautiful cat's lines or stones with a shiny apple green or honey color are traded at high prices. It is the birthstone for February and is a gemstone that is perfect for Japanese clothing.

It is a rare stone that is only mined in Germany, with a beautiful vivid cobalt blue sparkle. Only small stones are mined, most of which are less than 0.1 carats. However, the vivid blue color makes it stand out even under 0.1 carats, and it is used as an accent in jewelry. Another attractive feature is that it turns orange when exposed to black light. It is a gemstone with relatively many inclusions, but the fewer the inclusions and the darker and more vivid it is, the higher the price it is traded for.

Topaz is relatively inexpensive, but Imperial Topaz is in a class of its own. As its name suggests, it means Emperor among topazes. Most of them come from Brazil.Usually, topaz is artificially treated, but imperial topaz is not, and has an attractive red to orange to pinkish sherry color. Imperial topaz comes in many colors, but bright, vivid reddish imperial topaz is traded at a particularly high price.

Ruby is a representative colored stone that everyone knows. Only the "red" version of the same mineral is called ruby, and the other colors are called sapphires. Among them, only rubies with high transparency and a deep, beautiful red color are called pigeon blood, and their value increases dramatically. Furthermore, unheated stones from Myanmar (formerly Burma) are traded at the highest prices.

Sapphires come in a variety of colors, including pink, orange, yellow, and violet, in addition to blue. The most representative of these is blue sapphire. Among them, a strong, vivid, deep blue is named "royal blue" and is considered to be the highest quality. Sapphires that are lighter and more vivid than royal blue are named "cornflower." These are also traded at a higher price than regular blue sapphires. Like rubies, unheated stones from Myanmar (formerly Burma) are even more valuable.

Emeralds are gemstones with many inclusions. Therefore, impregnation treatment is applied to make the inclusions less noticeable and increase transparency. Most emeralds are impregnated, but non-oil emeralds are beautiful even without this treatment. They are quite rare and more durable, so their price increases dramatically. If they are from Colombia, their value increases even more.