Process of Casting silver Jewellery
A two-step process, investment casting, produces small, complex shapes. Most castings, especially large ones, are made in sand molds. Permanent metal molds are used to make many small, simple parts; shell molding gives greater accuracy for a large volume of semi precision parts.
Molten silver is poured into the cavity and allowed to solidify. Sand, mixed with a binder to hold it together, is pressed around a wooden pattern that leaves a cavity in the sand. Wax or plastic replicas of the parts are molded in accurate metal molds. Top of the line casting equipments are utilized to produce the silver jewellery. When the whole mold is heated, the replica melts, leaving behind a cavity into which silver is poured.
Gems are silicates which can be very stable, hard minerals. Like gemstones, one of the characteristics of a precious metal is its rarity. A few gems are oxides and only one gem, diamond, is composed of a single element, carbon. Often, new names will be created for ordinary sounding minerals which sound prettier or more valuable, such as Moldavite for the green variety of tektites.
It could not be "precious" if it were common! This means that the metal must be malleable, that it can be bent, hammered, or otherwise shaped. Two other characteristics are also important. There are also many gemstones that are not true minerals, but which are gemstone varieties of recognized minerals.
Selection of right wedding ring
Choosing the right ring becomes too necessary because the idea behind a wedding ring is of great significance. A couple has to consider many factors when they are going to select wedding rings. The early Roman era is credited with the initial custom of giving rings for wedding purposes.
These factors include metal type, size and style. Most important factor when buying or ordering the wedding rings the couple should consider the price of the ring. They often end up spending more on other wedding requirements that are too essential. Some people may also order wedding rings that are handmade to turn this auspicious occasion into an even more important and special. Many of these gold bands were engraved with expressions of affection or important dates. It was not uncommon to find 19 th century wedding rings using pearls or small diamonds. Internet can prove to be a very supporting resource for people who are looking for handmade wedding rings.