Scheelite, named for Swedish chemist C.W. Scheele is a calcium tungstate, a major source of tungsten. Most scheelite is fluorescent and ranges from blue to white in color. Spectacular, transparent crystals come from Austria, Italy, Brazil, Rwanda, and Colorado. Scheelite crystals often have high luster and fire that is almost adamantine.
Schorl is the most common species of tourmaline, however, it is not as commonly faceted as its brightly colored brothers and sisters because of its black color. Well-formed schorl crystals make striking mineral specimens and long, thin schorl crystals are frequently found in quartz, called "tourmalinated quartz."
Scolecite is a fascinating zeolite mineral. Its name is derived from the Greek word, skolex, meaning worm because under a flame, scolecite curls up like a worm. It shares the unusual properties of piezoelectricity and pyroelectricity with other gem minerals like tourmaline.
Selenite is the name for transparent, colorless to near colorless crystals of gypsum, a hydrous calcium sulfate that is found in a number of forms. The name "selenite" comes from the Greek word selene, meaning "moon", no doubt in reference to the gem's white glow. Gypsum, in all varieties, is very soft and has perfect cleavage so it should be handled with care.
Nicknamed the "dragon stone," septaria has unique mineral patterns that resemble tree branches. Specimens are usually in the form of sliced nodules ranging from an inch in diameter to more than three feet across. They are estimated to have formed between 50 and 70 million years ago after periodic volcanic eruptions killed small sea life. The shells and carcasses of these creatures sank to the sea bed, where sediments accumulated around them to form nodules or balls of mud. When the waters eventually receded, the mud balls dried out and began to shrink and crack into the beautiful patterns that you see inside the septarian nodules.
Seraphinite was named after Seraphim, the highest rank of angels in the Bible, due to the feather-like appearance of its chatoyant fibers. The stone usually has a dark green to gray color with silvery shimmer caused by mica inclusions. This unique, somewhat mystic-looking gem is often used for carvings, decorative pieces and cut as cabochons.
Serpentine is well known to the world's mineralogists and gemologists, but is much less familiar to the general public. The marbled look of this green stone makes it ideal as an ornamental material, and it has been carved into a wide array of decorative objects throughout history. Although serpentine has a similar appearance to jade, it is a different, unrelated series of minerals.
Shanseres® is a new variety of Diopside offered for the first time at Jewelry Television in June of 2007. This type of Diopside is not treated, the color is natural, and unlike our very popular gem Chrome Diopside, Shanseres® has no presence of chromium. The lack of chromium is about the only difference between chrome diopside and Shanseres®.
Shattuckite is an extremely rare cuprian mineral that is found mixed most commonly with quartz. Its name is derived from a find in the Shattuck Mine in Bisbee, Arizona. Shattuckite comes in pale to striking blue shades.
Shells are the protective outer coverings from various animals. Most of the shell used in jewelry comes from helmet conchs, mollusks, black-lipped oysters, and abalone. The earliest known shell jewelry dates to 82,000 years ago from a site in Morocco. It is thought that shell’s first use as an ornamental material was a byproduct of the search for food. Shell is best known for its use in mother-of-pearl buttons and knife handles. Cameo carvers take advantage of the different colored layers of shell to create images of beautiful women and classical scenes.
“Shell pearls” are imitation pearls. A mother of pearl bead nucleus is coated to resemble Tahitian, South Sea, or freshwater cultured pearls. They are an affordable alternative to their more expensive counterparts.
Siderite was discovered in 1845 and derives its name from the Greek sideros (iron). Siderite has perfect cleavage in three directions and comes in a wide variety of crystal habits and colors.
Beautiful and rare, sillimanite is named for the famous American geologist Benjamin Silliman. It was relatively unknown until a substantial find was discovered in Orissa, India, in the 1990's. Sillimanite is not only scarce, but it also difficult for miners to identify and is problematic for cutters. These three attributes ensure that sillimanite remains a true exotic gemstone. Sillimanite ranges from colorless to white, brown, yellow, blue, and green in color and consists of compact fibrous material that have a silky luster. A polymorph of kyanite and andalusite, sillimanite makes an exciting addition to any gemstone collection.
Sinhalite is named after its discovery location, Sri Lanka, using its Sanskrit name, Sinhala. This rare gemstone was, until recently, only found in Sri Lanka, but is now mined in Tanzania, Madagascar and Burma. Often occurring in green to brown to brownish black hues, it was once mistakenly believed to be a variety of olivine.
Smithsonite is named for James Smithson, the English founder of the Smithsonian Institution who first identified the mineral. Although it rarely forms crystals, smithsonite is most commonly found as botryoidal or stalactitic masses or as honeycombed aggregates. A member of the calcite group of minerals, smithsonite is prized for its variety of crystal forms. Smithsonite comes in a wide variety of colors depending on the impurities present. The presence of copper gives smithsonite its green to blue coloring. Trace amounts of cobalt are responsible for pink to purple hues while cadmium makes smithsonite yellow, and iron gives it a brown to reddish-brown color.
Smoky quartz is an earth-toned transparent quartz that comes in a variety of shades, including cognac. Smoky quartz gets its rich warm colors from color centers when aluminum replaces silica in the crystal lattice of the quartz after exposure to gamma rays. A popular ornamental stone, it is often carved into figurines and ornate statues, but makes quite a statement when faceted into stunning gemstones.
Soapstone, also known as steatite, refers to compact masses of talc and other minerals known for their soapy or greasy texture. Due to its softness, it has been used since ancient times for carvings, ornaments and utensils.
Sodalite is a mineral used most often for carvings and some types of jewelry. Known for its rich, royal blue hues, sodalite is found in limited areas of the world. Frequently mottled with white veins of calcite, sodalite resembles lapis lazuli in appearance and has been mistaken for it at times. It can occur not only as blue, but also in crystals of gray, yellow, green or pink color.
South Sea Pearl
Highly coveted South Sea pearls are often described as the pinnacle of cultured pearls--they're certainly among the most rare and expensive available. Primarily farmed in the pristine waters off Australia, the Philippines, and Indonesia, South Sea pearls are generally much larger than other pearl types, ranging from nine to 20 millimeters, and have a unique luster due to their nacre coating. As there are two varieties of this oyster, a gold-lipped and silver-lipped, pearls can be both white to silver and golden.
Spectrolite is the tradename for the phenomenal labradorite variety from Finland. Spectrolite is known for its colorful and striking iridescence that shows blue, green, yellow, orange, and red colors. The colors are often compared to the northern lights seen in the Finnish night sky. Depending on the account, Spectrolite was discovered in either the winter of 1939-1940 or 1941 when Finland was building border fortifications during the Finnish-Russian campaign in WWII. Spectrolite mining started after the war. In 1973 a workshop was established in the Ylämaa area, Lappeenranta, South Karelia, Finland for cutting and polishing the gemstone.