Tigers Eye is an example of a Chatoyant quartz, they are usually cut en cabochon and polished as this displays the stripes better.
The cat's eye effect can be seen in cabochon cut quartz, chrysoberyl and tourmaline and is known as "chatoyancy" and is shown as a wavy and changeable band of light across the top of the cabochon.
The cat's eye effect can be seen in cabochon cut quartz, chrysoberyl and tourmaline and is known as "chatoyancy" and is shown as a wavy and changeable band of light across the top of the cabochon.
A cabochon cut quartz refers to a particular style of cutting and shaping a quartz gemstone. The term "cabochon" (pronounced kah-buh-shawn) comes from the French word "caboche," which means a small dome or rounded shape. In this type of cut, the quartz is shaped into a smooth, convex form with a flat back and a rounded or domed top. Unlike faceted gemstones, which have multiple flat surfaces and angles, cabochons have a curved surface that showcases the stone's natural color, patterns, and inclusions. The smoothness of the cabochon cut gives the gemstone a polished and glossy appearance. Quartz is a popular material for cabochons due to its abundance and wide range of colors and varieties. Some common types of quartz used for cabochons include clear quartz, rose quartz, amethyst, citrine, and smoky quartz. Cabochon-cut quartz gems are often used in jewelry, such as pendants, earrings, rings, and bracelets, and they can be set in various metals or combined with other gemstones to create unique designs.
There are various kinds of gem polishers. Faceting machines are used to cut transparent gems, like diamonds. Cabochon machines are used to grind low rounded domes or irregular shapes, usually opaque; eg. much turquoise is cut in cabochon form. A tumbler is used to round and polish a wide variety of less valuable gems.
Beryllium Aluminum Silicate
Presence of a few ppm of ferrric oxide
Emeralds are a form of the mineral Beryl and as such are related to Aquamarines and Morganite.
The general formula is Be3Al2(SiO3)6.
Most jewelers often use a cabochon cut, which is typically used for patterned gems. It gives the stone a flat base and a domed top without faucets. If you cut the stone correctly it allows the moonstone to reflect the light, giving the gem it's renowned glow that seems to float above the stone.
That would depend on the context in which brilliant was used. Brilliant can be a description of the cut of a diamond, intelligence, light, lustre or polish etc. The opposite would be different in each circumstance. eg dull, thick, dim, cabochon.
Aquamarine is a silicate with the general formula Be3Al2(SiO3)6.