Thursday, 15 May 2014

Stone Settings


This post of ‘Jewel Affair’ will talk about an extremely interesting subject which is stone setting. Stone setting can be described as an art of securely setting gemstones into an ornament. It can be said that it is comparatively easy for a designer to sketch a design, but the real challenge is to bring life to that design. This can be accomplished when one decides what settings will be applied to that design to transform it into an exquisite piece of jewelry.
There are many variations of stone settings but in this post we will be going through the most important and commonly used ones.
 
STONE SETTING RING

Bezel setting:
Bezel is the earliest known technique of stone setting. It can be described as a strip of metal which is bent and fashioned according to the shape and size of the stone. And the girdle or the edge of the stone is seated on this metal strip. The metal extends slightly above the stone and the extended part is pressed over the stone to secure it. This type of setting is most commonly seen in ornaments made for astrological purposes.
A square or a rectangular bezel is often termed as Box setting.
 
BEZEL SETTING
Picture Courtesy: Sri Krishna Diamonds & Jewellery
Prong setting:
In this method a metal socket or a collet is prepared and from this socket the metal is projected. This projection overlaps the edge of the stone and secures it to the setting. Prong setting is the most commonly used setting because it uses the least amount of metal to secure the stone and this reason in return brings out the brilliance of the gemstone a lot more. There are different kinds of prongs made like square, emerald, Navette, and Tiffany. This setting is popularly known as open setting.
 
PRONG SETTING
Picture Courtesy: Sri Krishna Diamonds & Jewellery
Channel setting:
In channel setting the stones are set usually between two metal ridges running parallel to each other. The sides of the mounting grip or hold the outer edges of the stones. And also in between two stones there is no metal present.
 
CHANNEL SETTING
Picture Courtesy: Sri Krishna Diamonds & Jewellery
Bead setting:
In this method of stone setting holes are drilled on a metal base and depressions are formed with the help of a tool according to the size of the stones. And then prongs are made with the help of a beading tool and the stones are pushed in. then the prongs are pressed over the stones for securing them.
 
BEAD SETTING
Picture Courtesy: Sri Krishna Diamonds & Jewellery
Pave` setting:
Pave` is a word of French origin, derived from ‘paver’.  This is a type of bead setting in which as many stones as possible are set very close to each other to show the minimum amount of metal.
 
PAVE` SETTING
Picture Courtesy: Sri Krishna Diamonds & Jewellery
Gypsy /Flush setting:
This is a modification of bezel setting. In this the stones are set with their girdle completely covered. A metal seat is cut out in the shank and the edges are burnished over the stone. The stone looks roughly flushed with the surface. This setting is gaining importance in contemporary jewelry.


Illusion setting:
Illusion setting is a kind of prong setting which is used to create an illusion that a stone or a cluster of stones is larger than what it actually is. A metal surrounding metal ring is created to diffuse the sharp outline of the stone. When a cluster of stones are set in this manner it gives an illusion of a solitaire.
 
ILLUSION SETTING
Invisible setting:
This setting was introduced by one of the most prestigious jewelry houses of France- Van Cleef &Arples in 1935. In this setting stones with parallel edges can be set on a surface without the metal being visible. It appears as if nothing is holding the stones in place. But, the stones are secured with metal grids on their undersides in which each stone is fitted and held with small grooves.
 
INVISIBLE SETTING
Picture Courtesy: Sri Krishna Diamonds & Jewellery
Pressure setting:
In pressure setting seven or more diamonds are used. The center stones is surrounded and held by the other stones. In this setting the circumference of the stones is very important because the slightest difference may cause them to fall off. This setting is also somewhat like illusion setting. It generally creates the illusion of a solitaire and this is what makes this setting so popular.
 
PRESSURE SETTING
Tension setting:
In this setting a stone can be set with the pressure/tension of metal surfaces. The stone seems to be suspending only with the pressure of the metal enforced on it.  But actually, grooves are created on the metal surfaces for the stone to rest. But for this particular setting the security of the stone is highly debatable.

TENSION SETTING
Picture Courtesy: Sri Krishna Diamonds & Jewellery

Closed setting:
Closed setting is used when one intends to have metal behind the stone so that the lower part of the stone is not visible. This is done in order to prevent any dust particles from getting collected around the stone. This setting is done with 22k gold and is extremely popular in southern parts of India.
 
CLOSED SETTING
Picture Courtesy: Sri Krishna Diamonds & Jewellery
There are various other settings like Fishtail setting, Micro-pave`, Bar and Scallops which are gaining importance gradually.

One would conclude by saying that these settings are the fundamental building blocks of Jewelry design. Being well versed with the technicalities of these settings help you in creating practical and beautiful designs.


Thursday, 1 May 2014

Introduction to Metals Used in Jewelry


We all are well aware that jewelry is a field where there is massive utilization of metals. These metals range from brass, copper, silver, gold and platinum. For a designer it is essential to be well versed with each and every product which is used in creating jewelry; and undoubtedly metal is one of the most important products used in it. One has to get into the detailed study of metals because it turns out to be the biggest help when the design is in the process of getting manufactured. 

In today’s post we will go through the three widely used metals:

  • Gold
  • Silver
  • Platinum

First and foremost, what is a metal?

The word metal has been derived from the Greek word metallon/mettalum which means ‘to search for’. Metals are natural elemental chemical or mineral substances each possessing a distinctive crystalline atomic structure. In other words metals are solid lustrous materials which are characterized by their properties. These properties include their atomic weight, specific gravity, melting point and thermal and electrical conductivity. But the most elemental are:

Plastic/Fusible: metals can be fused or melted and can be worked without rupture.

Ductile: metals permit being drawn into wires.

Malleable: metals permit compression by hammering and rolling.

CLASSIFICATION OF METAL

 NON FERROUS METALS
FERROUS METALS

 
NOBLE METALS
BASE METALS
 
Gold
Aluminum
Iron
Silver
Lead
 
Platinum
Tin
 
 
Mercury
 
 
Nickel
 

 
GOLD:  in the history of mankind, gold has been one of the most fascinating metals because of its rarity, non-corrosiveness and for its lustrous, unique bright yellow color. Gold is said to be virtually indestructible because it does not rust or corrode.

Gold has a melting point of 1063 degree Celsius. And its specific gravity is 19.36. Purity of gold is measured in ‘Karats’. The fineness for gold in terms of karat is expressed as being equal to 1/24 part of pure gold in an alloy. Higher the karat more is the content of pure gold. Purest form of gold is 24K which is too soft to be used for jewelry, so it’s usually alloyed with one or more metals to make it more workable. 24K is 99.9% pure gold. 18K gold is considered ideal for stones and diamond setting jewelry, since this alloy becomes very hard and therefore provides a good grip for gems and diamonds.

ALLOYS
% OF PURE GOLD
%OF OTHER METALS
MELTING POINT
SPECIFIC GRAVITY
22K
91.6
8.4
977* C
17.3
18K
75
25
882* C
15.5
14K
58.3
41.7
802* C
13.4
10K
41.6
58.4
876* C
11.6

Nowadays gold is also available in many colors. For this purpose gold is alloyed with one or more metal.

COLOR OF GOLD
COMPOSITION
White
Gold + Nickel/Palladium +Zinc +Copper
Green
Gold + Silver+ Copper+ Zinc
Rose/Pink
Gold+ Copper
Black
Gold+ Cobalt / Chromium

PINK/ROSE GOLD
Picture Courtesy: Sri Krishna Diamonds & Jewellery, Commercial Street, Bangalore
 
YELLOW GOLD


WHITE GOLD
Picture Courtesy: Sri Krishna Diamonds & Jewellery, Commercial Street, Bangalore
 

BLACK GOLD

 
Half of the world’s gold resources are in South Africa. Other major sources are in the United States of America, Brazil, Australia, Canada, China and Russia.

 
SILVER: 

Like gold, silver is also a prized metal for its beauty, usefulness and metallic bright luster. It is a medium heavy, ductile and malleable metal. On exposure to oxygen in the air, silver oxidizes and a black layer of silver oxide is formed on the surface. Silver is also a very soft metal to work with hence, it is alloyed with copper.

ALLOYS
% OF PURE SILVER
%OF OTHER METALS
Sterling silver
92.5
7.5% Copper
Britannia silver
95.8
4.2% Copper & Zinc

STERLING SILVER
 
Sterling silver is most widely used for kitchenware and cutlery. Britannia silver was introduced in Great Britain in 1697 by William III to limit the practice of melting and clipping sterling silver coinage.

One of the most important uses of silver is ‘soldering’. A solder is an intermediary non-ferrous alloy which in its molten state is able to join different or similar metals together. So, soldering can be defined as a process of joining metals with the use of solder and applying heat to the object.

There are three different kinds of solders:

TYPE
COMPOSITION
Hard solder
75% Silver + 15% Copper + 10% Zinc
Medium solder
70% Silver + 15% Copper + 15% Zinc
Easy Flow solder
65% Silver + 20% Copper + 15% Zinc


Important mining sources for silver include South America, United States of America, Australia and the former USSR. The finest silver is produced by Norway and the largest producer of Silver is Mexico.


PLATINUM:

Platinum got its name from the Spanish term Platina which means ‘little silver’. It has a grayish-white lustrous appearance and is more ductile than gold, silver and other metals. It is a dense metal and does not corrode which makes it fit for jewelry. The price for platinum is higher than gold because it is a very rare metal. Platinum is alloyed with copper and cobalt to increase its workability. In any alloy there should be at least 85% pure platinum.

PLATINUM
Picture Courtesy: Sri Krishna Diamonds & Jewellery, Commercial Street, Bangalore

Platinum experts state that 75% of the platinum in the world is produced by South Africa, 14% by Russia. The other producers are Zimbabwe, Canada and the United States of America.
 
 
To conclude, one would like to say that every metal is unique and working with it is an art in itself. So, take a plunge in these facts n figures and explore the interesting study of metals.