Stefano Oro 14K Gold Choice of 7mm Clover Shape Gem Stud Earrings

In order to determine the karat weight of a specific item, simply look for the quality mark. Jewelry items will bear the stamp of their karatage based upon the United States or European system of marking. The United States system designates pieces by their karats—24K, 18K, 14K, 10K, etc. The European system designates pieces by their percentage of gold content. For instance, 10K gold is marked “417,” denoting 41.7% gold; 14K is marked “585,” denoting 58.5% gold; and 18K is marked “750,” denoting 75% gold; etc.

Mother-of-Pearl
Mother-of-pearl is found on the shells of mollusks, such as mussels and oysters, and the shells of pseudopods, such as snails. When the young of these creatures come into the world, they create a shell "house" in order to preserve their existence. The walls of this housing are formed with layers of their secretions, ensuring a simultaneous growth of house and creature together.

Depending on the type of animal and the environment in which it lives, secretions create various shapes and colors found on the different types of mother-of-pearl. White mother-of-pearl comes from pearl-bearing oysters. It features high reflective properties and is one of the most commonly used types of this material. Iridescent mother-of-pearl is a type in which the colors of pink and green are predominant, while variegated mother-of-pearl is a multicolored type. Stone mother-of-pearl is white with a low reflective power, while mat mother-of-pearl is dull grey and also has a low reflective power.

The shiny quality of mother-of-pearl has attracted attention for thousands of years. The Louvre Museum features mother-of-pearl objects that belonged to the Sumerians and were found in Mesopotamia. In China, a dish with geometric-shaped pieces of mother-of-pearl was found that belonged to the Tang Dynasty in 618-906 A.D. Mother-of-pearl work was also common in ancient Italy, Greece and Cyprus. Today, different types of mother-of-pearl are commonly used in the art world. This type of art is certainly a challenge, for in order for them to be made into works of art, the mother-of-pearl pieces must be thick enough to withstand being worked upon and be of high enough quality to beautifully reflect colors of the rainbow.

Onyx
Onyx is a variety of chalcedony quartz that features a fine texture with a smooth black color. Some onyx can display white bands or ribbons against black or brown backgrounds. The bands that move through the stone run parallel and onyx is therefore sometimes known as zebra agate. Mined in Brazil, India, California and Uruguay, most onyx today is color-enhanced to increase its depth of color. It ranks a 6.5 on the Mohs Scale and is an ideal stone for carving. In fact, it is a favorite material of lapidary artists.

Onyx was very popular with the ancient Greeks and Romans. The name comes from the Greek word "onux" which means fingernail. Legend says that one day frisky Cupid cut the divine fingernails of Venus with an arrowhead while she was sleeping. He left the clippings scattered on the sand and the fates turned them into stone so that no part of her heavenly body would ever perish. In Greek times, almost all colors of chalcedony were called onyx. Later, the Romans narrowed the term to refer to only the black and dark brown colors, while the reddish brown and white onyx became known as sardonyx. Highly valued in Rome, sardonyx was especially used for seals because it was said to never stick to the wax. Roman General Publius Cornelius Scipio was famous for wearing sardonyx.

Worn during mourning in the Victorian age, onyx is now traditionally given as a 7th wedding anniversary gift. It is thought to increase happiness, self-control, courage, intuition and instincts. The stone is also believed to cool the yearnings of love and decrease sexual desire.

Earring Back Types

Butterfly Back: A double looped piece resembling a butterfly that fits over a post. Variations on this design are called push back clasps. The basic post and butterfly back are usually used for stud earrings and lighter weight drop earrings.

Hinged Snap Backs: This clasp features a hinged post that snaps into a groove on the back of the earring. It is commonly found on hoops. Sometimes the hinged post is curved to provide more room to fit around the ear, sometimes called a saddleback.

Hook Backs: This earring backing is simply a long, bent post that fits through the piercing. Hooks have several variations, most notably the shepherd's hook and the French hook. While thin wire hooks reduce the weight of long earrings, making them more comfortable, they aren't as secure as other clasp styles.

Lever Back: A hinged lever snaps shut against the curved post to form a closed loop around the ear lobe. This clasp is very secure and good for large or medium sized styles that drop just below the ear.

Omega: Also called French clips, this clasp has a straight post and a looped lever. The hinged lever closes around the post and is held against the ear with pressure. The omega clasp is the most secure clasp, especially for the larger, heavier earrings.

Screw back: This backing is a slight variation of the standard post and butterfly nut back. Instead of pushing on the back, the nut twists onto the threaded post. A screw back post design is often preferred for expensive diamond stud earrings that require increased security.

Malachite
Malachite is a stone that features light and dark green banded areas. Sleek and luxurious in texture, it contains natural black bands that vary from piece to piece, making it special and unique. Ancient Egyptians began mining it as early as 4000 BC! Malachite gems are found naturally combined with other minerals, such as chrysocolla. It's commonly found in Zaire, Russia, Germany, France, Chile, Australia and the southwestern United States. Considered the guardian stone of travelers, malachite is worn to detect danger and is believed to break into pieces when danger is near. Many believe malachite possesses the ability to calm the nerves. It is also known for creating peace, hope and success in business, as it can bring understanding and patience to those in its presence.