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Fine Jewelry University Articles matching: “Antique hallmark number 2”
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What are “Blood Diamonds”?
… of the decisions of the Security Council.” These diamonds are sometimes referred to as “blood diamonds.” In July 2000, the global diamond industry made clear to the international community its zero tolerance policy towards conflict … Partnership Africa Canada to create the Kimberley Process Certification System. This system was formally adopted in 2003 and guards against conflict diamonds entering the legitimate diamond supply chain. The diamond industry also …
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Gold Purity and The Differences Between White and Yellow Gold
…is an expression of love. Gold Purity Is all gold the same? We hear a piece of jewelry is pure gold or solid gold or 24 karat gold, but what does it all mean? Gold used in jewelry like wedding rings can come in many forms. Basic to … grade is used to express the proportion of gold in an alloy or the quality of a gold alloy. Fine (pure) gold is 24 karat. The proportions in other karat grades are listed in the table below: Karat Parts Gold to Alloy Percentage …
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Gem in the Spotlight: Spinel
… birthstone list. Spinel will be joining peridot as the August birthstone! This change was officially made in 2016, but only in the last couple of years have we started to see the majority of the industry get on board. If you know … index of 1.718 while its synthetic counterpart (depending on the process used) has a refractive index of 1.728. In recent years, scientists have developed new techniques to synthesize sheets of optically transparent spinel. This …
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Gem in the Spotlight: Amethyst
… of quartz at 1.54-1.55 and is doubly refractive. It has a vitreous polish luster and its specific gravity is 2.66. Its chemical composition is SiO2. History and Lore The rich history of amethyst dates all the way back to ancient Greek… were found in multiple places around the world. Heavily increased supply dropped prices consistently over the last 200 years which is why, despite its beauty, amethyst is such an affordable stone today. About 50% of amethysts on the …
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Gem in the Spotlight: Tourmaline
…unlike emerald and aquamarine, for example, which are members of the beryl family). It has a refractive index of 1.624 to 1.644 and a Mohs hardness of 7 to 7.5 which makes it softer than topaz or sapphire and harder than tanzanite or … a long trend of confusing tourmaline with other gems. Another notable example of this is the “Caesars Ruby,” the 255ct stone in the Russian crown jewels that has been traded between France, Russia, and Sweden for centuries. It was …
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Gem in the Spotlight: Emerald
… of emerald ranges from 1.57 to 1.58, making it a moderately refractive gemstone. Its specific gravity ranges from 2.65 to 2.75. One of the distinctive features of emeralds is that they often contain inclusions. Sometimes these … structure. Hollywood celebrities have had a fondness for emeralds for many years. Elizabeth Taylor received a 23.46 carat emerald and diamond pendant/brooch from her future husband Richard Burton during the shooting of Cleopatra . She…
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Gem in the Spotlight: Tanzanite
…its desirability. Tanzanite is currently one of the rarest gemstones, and it is only found in one place on earth. In 2002 tanzanite was added as one of the birthstones for December alongside blue zircon, turquoise, and blue topaz. …Tanzanite is the largest rough tanzanite in the world, weighing around 6 pounds (over 13,000 carats!). Discovered in 2005, it has dimensions of 218.44x 80.01 x 71.12 mm. Its name is inspired by the second-highest peak of Mount …. As if the amazing color of tanzanite wasn’t enough incentive to collect them, there is more to the story. In 2019, the Tanzanian government closed the only large-scale tanzanite mine in the world. There are a few smaller-scale mines …
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Types of Jewelry Clasps
…, spring-loaded mechanism that snaps shut to secure the jewelry. Other types of jewelry clasps that emerged in the 20th century include the lobster clasp, which features a spring-loaded mechanism that opens and closes by pressing a … virtue of the strength of the wire to hold its curved shape alone. S hooks usually work best in higher karat gold (21k and higher) because they are more malleable and don’t get brittle over time as easily. Unsurprisingly, one common …
