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123WordGold JewelryBecause of the softness of pure (24k) gold, it is usually alloyed with base metals for use in jewelry, altering its hardness and ductility, melting point, color and other properties. Alloys with lower caratage, typically 22k, 18k, 14k or 10k, contain higher percentages of copper, or other base metals or silver or palladium in the alloy. Copper is the most commonly used base metal, yielding a redder color. Eighteen carat gold containing 25% copper is found in antique and Russian jewellery and has a distinct, though not dominant, copper cast, creating rose gold. Fourteen carat gold-copper alloy is nearly identical in color to certain bronze alloys, and both may be used to produce police and other badges. Blue gold can be made by alloying with iron and purple gold can be made by alloying with aluminium, although rarely done except in specialized jewelry. Blue gold is more brittle and therefore more difficult to work with when making jewelry. Fourteen and eighteen carat gold alloys with silver alone appear greenish-yellow and are referred to as green gold. White gold alloys can be made with palladium or nickel. White 18 carat gold containing 17.3% nickel, 5.5% zinc and 2.2% copper is silver in appearance. Nickel is toxic, however, and its release from nickel white gold is controlled by legislation in Europe. Alternative white gold alloys are available based on palladium, silver and other white metals (World Gold Council), but the palladium alloys are more expensive than those using nickel. High-carat white gold alloys are far more resistant to corrosion than are either pure silver or sterling silver. The Japanese craft of Mokume-gane exploits the color contrasts between laminated colored gold alloys to produce decorative wood-grain effects. wiki Gold JewelryGoldGold dissolves in mercury, forming amalgam alloys, but does not react with it. Gold is insoluble in nitric acid, which will dissolve silver and base metals, and this is the basis of the gold refining technique known as "inquartation and parting". Nitric acid has long been used to confirm the presence of gold in items, and this is the origin of the colloquial term "acid test," referring to a gold standard test for genuine value. |
More JewelryAsscher diamondsInvented in the early 20th century by the Asscher Brothers of Holland, an Asscher cut is a modification on the cushion cut, which was popular in the 19th century. The brothers invented a square to rectangular cut with a flat tabletop surface, many small step cuts along the top area, and larger longer facets underneath the diamond. Asscher cuts are parallel to each other, and unique in that attention to the exact ratio between the diamond's depth and the table sizes is key to brilliance. The newest interpretation of the Asscher cut has 74 precisely placed facets that truly reveal an unsurpassed depth and beauty.bracelet word 123 jewelry bracelet bracelets jewelry store bracelets collectibles 123word collectibles cufflinks 123word cufflinks diamonds fine jewelry diamonds earring jewelry retailer earring earrings jewelry box earrings earrings 123word earrings gemstones gold jewelry gemstones gifts silver jewelry gifts handbags 123word handbags jeweler promise ring jeweler jewelers diamond jewelry jewelers jewelry bridal jewelry necklace word123 necklace necklaces jewelry exchange necklaces pearls fashion jewelry pearls pendants sterling silver jewelry pendants purses 123word purses rings silver ring rings store 123word Best gift store |
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