What materials make up costume jewelry beads

We love jewelry, but how they are classified into and what classification is often used in our daily life. I guess many of you are not firmly sure. This time we will talk about costume jewelry beads which occupies a big part of our every-day's ornament.
1. Zirconia, rhinestone, glass, and plastic take a chief role in costume jewelry field. And the most faddish are cubic zirconia and cheap rhinestones due to their physical characteristics and price. You know this pair of stones has excellent crystal refraction which can change the sunlight from colorlessness into various colors. Based on this reason and their similarity, some people call them "twin stones”. All of them often appeared as simulated versions of precious gemstones such as diamonds, rubies, sapphires, and emeralds. Usually the sparkly appearance and relatively low price made space for much larger, more glittering fashion charms that are able to immediately attract attention. Such jewelry beads are popular because of the sparking appeal and colored choices. Epoxy and acrylic are plastics that are often used to make inexpensive jewelry beads.
Besides manual stones occasionally pearls, topaz, black opal, amethyst, or peridot are used because these semiprecious stones can make a more positive influence on jewelry attraction.
2. Base metal such as tin, steel, brass, nickel, aluminum or a combination of metals such as alloy sometimes is transformed to resemble the precious metals like platinum, gold or silver. Once done the products can bring about fine effects, smooth, glitzy, as beautiful as the precious metal, through the following methods:
(1). TONE: merely means color of the metal. That is to say, Gold and silver tone jewelry are only gold and silver in color but never comprise actual gold or silver in the specific jewelry.
(2). ELECTROPLATING: means to use electric current to deposit a thin layer, as little as 2 mils (1 mil= millionth of 1 inch) onto the base alloy metal which is immersed in an arsoniumsalt bath solution of the precious metal and will be soon plated.
(3). LAYERING: this is similar to electroplating. But the plated object is immersed for a longer period for a much thicker layer of precious metal to be formed. Layered gold or silver may consist of about 20-50 mils of gold or silver. However it sounds and looks the experience told us that this thicker layer indeed assists the jewelry to last longer and more durable.
(4). OVERLAY: heat is utilized to agglutinate the base metal with the precious one to become a new alloy. This creates a permanent bond between the metals and it can be as sturdy and long lasting as the real one so long as kept under enough cares.
(5). TECHNIBOND: which is commonly recognized as one of the most desired methods for gold plating as technibond's crafty process is to bond a full 40 mils of 14kt gold with.925 sterling silver. For two metals' lovers it stands at the very junction of both worlds. The excellent junction!
3. Costume jewelry might also include some odd materials (which are just sounds odd, actually many jewelry fans really loves them because of their unique characteristics), they are like wood, stone, and shell which can be either natural or artificial.