There are the precious gemstones like diamond, ruby, sapphire and emerald. There are also the semi-precious gemstones like turquoise, amethyst, garnet and quartz. There are also the gemstones that are considered birthstones (like aquamarine for the month of March and peridot for the month of August) and anniversary stones (like blue topaz for the fourth year and onyx for the eleventh year).Know More
A gemstone is a piece of mineral that is used in cut and polished form to make jewelry or other adornments. However, certain rocks or organic materials that are not minerals are also used for jewelry and are therefore often considered to be gemstones as well. Most gemstones are hard, but some soft minerals are used in jewelry because of their luster or other physical properties that have aesthetic value.
Gemstones are classified into different groups, species and varieties. They are also characterized in terms of refractive index, dispersion, specific gravity, hardness, cleavage, fracture and luster. They may also be classified in terms of their "water." This is a recognized grading of the gem's luster, transparency and/or "brilliance." Highly transparent gems are considered "first water," while "second" or "third water" gems are those that have a lesser transparency.Learn more about Precious Metals & Gems
Sapphire is a very valuable blue gemstone, but it can take on a variety of colors, including white, yellow, pink and green. It is made from a colorless mineral called corundum, but this mineral contains trace elements such as iron and titanium that can turn it blue.Full Answer >
According to Jewelry Notes, a black sapphire is a type of sapphire that has a nearly opaque appearance. While the stone itself is blue, it's so dark that it absorbs all light entering it, resulting in the appearance of a solid black stone.Full Answer >
Rubellite is a red-colored gemstone differing from rubies in several ways: it is more rare than ruby; it is less dense; it is not as fiery or brilliant; and it is not as hard as a ruby. The beautiful red color of rubellite makes it desirable for jewelry, like ruby, but it is actually a tourmaline. Because it is less desirable for most buyers, rubellite is also much less expensive.Full Answer >
According to the second edition of the Standard Catalog of Gem Values, wholesale prices for faceted gem rubies range from $100 to $15,000 per carat. Wholesale prices vary based on color, size, origin and clarity.Full Answer >