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.
Diamond's clarity is graded
Diamonds with Slightly Included and better grading are progressively more expensive. These include; internal graining, cleavage, bearding, cavities, crystals or minerals, knots, feathers and clouds. After that, we go to the various grades of included diamonds. There are two types of flaws: an inclusion and a blemish. A blemish is something that mars the surface and distracts from diamond clarity.
This includes chips, pits, nicks, scratches, naturals, grain boundaries, and polish lines. The Internally Flawless diamond cannot have any inclusion, but may have surface blemishes. The diamond is then graded on the basis of five considerations: color, nature, position, size, and number. The clarity of the diamond is one of the primary determinants of price when it comes to rings, earrings, and other jewelry. This article will focus on how a diamond's clarity is graded.
How Durable is My Gemstone Jewellery?
First of all a note about the hardness and therefore relative durability of gemstones. To measure hardness, the jewellery industry uses the Mohs scale. This gem-trade standard, conceived by Friedrich Mohs in 1812, measures the ability of a gem or mineral to resist abrasion damage.
Diamond at 10 is the hardest whereas talc at 1 is the softest. Popular gemstones like amethyst and citrine register 7 whereas rubies and sapphires register 9. Most of us come off the beach on the first day with the 3 sís all achieved - rings caked in sand, sea-salt and suntan lotion. Nude sunbathing, as far as silver and gold jewellery is concerned, is a must! Remember also that sand will scratch the surface of precious metals.