Title: Necklace. General: This Choker is made from Sterling Silver, and is set with a removable Amethyst, so that the Choker may be worn on it's own, and the Amethyst may be worn on a different band. Material: Sterling Silver. Gem: Amethyst. Method: Constructed. Finish: Polished. Mechanics: The catch is a lockover type, making the band adjustable. Designer: W.van Heeckeren. Craftsman: W.van Heeckeren. Availability: This Choker is available on special order and the stone will have to be negotiated. Price: AUS $ 1200.00.
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.
name: AMETHYST (quartz group) colour: Violet, pale red-violet colour of streak: White mohs hardness: 7 specific gravity: 2.63-2.65 cleavage: None fracture: Conchoidal, very brittle crystal system: Hexagonal (trigonal);hexagonal prisms chemical composition: silicon dioxide transparency: Transparent refractive index: 1.544-1.553 double refraction: +0.009 dispersion: 0.013 pleochroism: Very weak; violet, gray violet absorption spectrum: (5500-5200) fluorescence: Weak; greenish
QUARTZ: Minerals of the same or similar chemcial composition are included under the single group of Quartz (SiO2 resp. SiO2.nH2O) silicon dioxide: Macrocrystalline quartz includes AMETHYST, AVENTURINE, ROCK CRYSTAL, CITRINE, PRASE, HAWK'S EYE, QUARTZ CAT'S EYE, SMOKY QUARTZ, ROSE QUARTZ and TIGER'S EYE. Microcrystalline quartz includes CHALCEDONY GROUP - AGATE, FOSSILISED WOOD, CHROPRASE, HELIOTROPE, JASPER, CORNELIAN, MOSS AGATE, ONYX and SARD. Amorphous quartz includes OPAL GROUP - PRECIOUS OPAL, FIRE OPAL and common opal.