SHOW: Rings 129
Title: Ring. General: Sterling Silver ring set with a Moonstone. Material: Sterling Silver. Gem: Moonstone. Method: Cast. Finish: Polished, Scratch brushed. Mechanics: Claw set. Designer: W.van Heeckeren. Craftsman: W.van Heeckeren. Price: AUS $ 600.00.
STERLING SILVER is a binary Silver alloy consisting of: 925 parts/1000 Pure Silver and 75 parts/1000 Pure Copper. Annealing temperature: 750 degrees Celsius. Melting Temperature: 950 degrees Celsius. Wal.
CASTING is a method by which moulten metal is poured into a mold in order to achieve the desired shape. In the "Lost Wax" method, an accurate wax model is made. The wax model is invested (put in a chrystobalite plaster), after the investment has set, the wax is burned out in a Kiln. This leaves a negative cavity into which the moulten metal may be poured. Wal.
Scratch brushing is a way of finishing Silver by brushing with a very fine brass brush, lubricated with detergent, in order to create a bright but soft look. First the item to be scratch brushed, is finely polished. The item is then annealed and pickled, and then scratch brushed. The entire process is repeated 3 times. Wal.
Claw Setting is done by making a setting from wire, which has a support for the stone, from which emanate wires, which can be bent over the stone to hold it in place. Wal.
name: MOONSTONE (Feldspar) colour: Colorless, yellow, pale sheen colour of streak: White mohs hardness: 6-6.5 specific gravity: 2.56-2.62 cleavage: Perfect fracture: Uneven, conchoidal crystal system: Monoclinic; prismatic chemical composition: K(AlSi3O8) potassium aluminium silicate transparency: Turbid, transparent refractive index: 1.520-1.525 double refraction: -0.005 dispersion: 0.012 pleochroism: None absorption spectrum: Not usable fluorescence: olive green
FELDSPAR: There are two main groups: Potassium feldspar called: Orthoclase ADULARIA ( MOONSTONES, SANIDINE) MICROLINE ( AMAZONITE ) calcium Sodium Feldspars called: PLAGLIOCLASE. ALBITE ( PERISTERITE ) OLIGCLASE ( AVENTURINE, ANDESINE, LABRADORITE, BYTOWNITE and ANORTHITE ).