SABOS Bead & Jewelry Show - 5-6 May 2012

"FIESTA SAN ANTONIO" - What is it ?

100 Events - 11 Days - 1 Fiestival

Fiesta San Antonio started in 1891 as a one-parade event. A group of ladies decorated horse-drawn carriages, paraded in front of the Alamo and pelted each other with flower blossoms. It evolved into one of this nation’s premier festivals, with an economic impact of more than $284 million for the Alamo City.

The funds raised by official Fiesta events provide services to San Antonio citizens throughout the year. So you could say that Fiesta never ends! Fiesta really is one of America’s truly great festivals. It began as a way to honor the memory of the heroes of the Alamo and the Battle of San Jacinto. That commemoration still takes place. But over the past century and more, Fiesta has grown into a celebration of San Antonio’s rich and diverse cultures.

2012 marks Fiesta’s 121st anniversary.

All Events 2012

Go to the following Web-site for an alaphabetical listing

http://www.fiesta-sa.org/events/all-events/

2012 FIESTA SAN ANTONIO ! - April 19th - 29th

Fiesta Spirit Seed-Bead Necklace and Earring Set .

Be prepared to shine during Fiesta San Antonio 2012 with a "Fiesta Necklace and Earrings".

PEDDLER's SHOW - Fredericksburg, TX

Yes, for those of you who are interested, a few miles away from the Texas Topaz Day festivities in Mason, Texas, this same weekend you will find the Peddler's Show at the Gillispie County Firgrounds in Fredericksburg, Texas. The Peddler's Show runs Friday afternoon and all day on Saturday and Sunday. Fredericksburg is also where you may find hotels or motels available if you are planning on staying overnigh for the festivities going on in Mason.

Topaz Day - Mason, Texas 24-25 March

For those that have asked for additional information concerning Texas Topaz Day in Mason Texas on 24 March and the Faceters Day on the 25th, go to Google or Yahoo and enter 'Texas Topaz Day'. You will get about 5 pages of listing concerning the events, including lists of motels (not many) and restaurants and directions as well as the times of different events.

Texas Topaz Day - Mason, Texas - Mar 24-25, 2012

This coming weekend the Southwest Gem and Mineral Society in San Antonio and the World Gem Society invites everyone to come to Mason, Texas, to join in the Texas Topaz Day festivities on Saturday, March 24th, followed by the Texas Faceters Guild Seminar Day on Sunday, March 25th. Mason, Texas, right in the heart of the Texas Hill Country is located in some of the most interesting geological formations to be found anywhere in the world. The festivities and events start at 10:00 am on Saturday and run all day with gemstone cutting and faceting demonstrations, jewelry and arts shows, and contests and music events to cap off the day. Then on Sunday you can join the Texas Faceters Guild for a day of learning about the latest in gemstone cutting and faceting. From novice to expert all are welcome.

The Blue Topaz was adopted as the Texas State Gemstone as a result of legislative approval on March 26, 1969. Petrified Palmwood was also named the State Stone by the same legislation. This Swiss Blue Topaz just above has been given a special cut to show the Texas Lone Star. A limited supply of these will be available over the two days in Mason, Texas.

Topaz occurs naturally in many colors including blue, orange, brown, green, pink, beige and red. Naturally occuring Blue Topaz is quite rare. Colorless topaz, the most common variation, can be treated by irradiation to produce a wide range of shades of blue, which are known as Sky Blue, Swiss Blue and London Blue. This treated, Blue Topaz is one of the most popular and widely used of all gemstones. London Blue is the most famous and most highly prized, but takes over 18 months to produce. Radiation scares have centered around the process and lasting effects from the making London Blue Topaz.

Some clear topaz crystals from Brazilian pegmatites can reach boulder size and weigh hundreds of pounds. Crystals of this size may be seen in museum collections. One famous Topaz is The Topaz of Aurungzebe and weighed 157.75 carats. Colorless and rarely light-blue varieties of Topaz are found in Precambian granite in Mason County, Texas, within the Llano Uplift in the Streeter, Grit, and Katemcy areas. It is usually found in streambeds and ravines but occasionally can be located atop the ground. Currently, only three Mason County ranches offer the public the opportunity to go Topaz hunting. They charge by the day, you keep what you find. You can enjoy Topaz hunting throughout the year except during the months of November, December and early January, when the ranches are closed for the deer season. There is currently no commercial mining of Topaz in that area. The natural Blue Topaz found in this area is the scarest of all the Topaz varieties.

Topaz is also the Birthstone for the month of November.

So as not to confuse the Lapidary enthusiasts, the Official State Rock of Texas is also Petrified Palmwood.
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"Benitoite" - the Blue Diamond of California !

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Sometimes called the " blue diamond", it was first discovered near the headwaters of the San Benito River, in San Benito County, California in 1906, from which it derived its name. It was at first thought to be a varirty of Sapphire, because of it's blue color. The gem is extremely rare and ranges in color from a light transparent blue to dark, vivid sapphire blue, and occasionally it is found in a violet shade. Benitoite is a somewhat obscure, but it is a wonderful gemstone. Benitoite was designated as the Official State Gemstone of California in 1985.

Benitoite is associated with a few rare minerals such as black-red Neptunite, snow white Natrolite and brown-yellow Joaquinite . The only source of this rare combination occurs at San Benito, California. A rare cluster of blue Benitoite and black Neptunite on top of a crust of white Natrolite is a treat for collectors. Gems much over one carat are uncommon. The sapphire-blue or colorless crystals are small. Gem quality specimens larger than two carats are rare. Faceted stones are usually under 1 carat, the largest documented stone is 7.8 carats and resides at the Smithsonian. Benitoites sell for over $1000 per carat and the price has been raising rapidly as the deposit has been largely worked out and available gems sold.

In 2000, Brian Lees of Colorado purchased the site from the long time owners. He brought in a mining crew and worked the mine for five winters. The current owner is now Dave Schreiner who bought the mine from Lees in 2005. Dave's vision was to open up the mine to collectors, since it is probably the most famous gem location in the world, and is on everybody's list of "places to collect." So now thanks to Dave Schreiner, gemstone and mineral collectors alike have that rare opportunity to come and try and find this unique and rare genstone.

California is a virtual cornucopia of gems, with the best known being Tourmaline, Kunzite, Serpentine and Topaz, all available to the public at open mines where you can buy buckets of dirt to dig through. In recent years, top-notch finds have helped restore the region’s splendor.

Serpentine, a green Jade looking material, is considered the State rock and of course Native Gold, a picture of which is shown at the right, is the Official State mineral. Of all the states where gold is found, only Alaska also considers Native Gold to be its State mineral.

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DIAMOND SIMULANTS !

I have been recently asked if I can again list what Diamond Simulants are on the market today and how do you tell if you have a simulant or real diamond. The problem is, new ones are appearing at regular intervals and it is very hard to stay current. Well the oldest test, but not totally conclusive is to run the diamond (or rock) across a piece of glass and if it scratches it, it is probably a diamond. As seen on TV you could hit it with a steel hammer ,and if it isn't ruined, it may be a diamond. Yea, but what jeweler or vendor in his or her right mind is going to let you do either of those two tests. So your best bet is to completely trust your gemologist or jeweler that what you are being sold is genuine. And if you bye a diamond from someone you don't know, you probably better make sure you can return it, because if you have it tested and find it is not a diamond, you want some recourse on what you spent. And of course the best saying is, "If it is too cheap for what it is suppose to be, it probably isn't what it is advertised to be!" The following is a chart of some simulants if you want to test for yourself.
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Common Diamond simulants and their gemological properties
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Material. Formula..Refractive Index.Dispersion.Moh's Hardness.Density.Thermal.Cond

Diamond......C..................2.417..............0.044...............10................3.52....Excellent

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Artificial Simulants:
Glass.......Silica...............~ 1.6................> 0.020.............6.............2.4-4.2........Poor

White Sapphire .Al2O3....1.762 ................0.018.............9.................3.97.........Poor
Spinel...MgO·Al2O3.........1.727.................0.020............8................~ 3.6..........Poor
Rutile......TiO2.................2.62 ..................0.33.............~ 6................4.25.........Poor
Strontium Titanate.SrTiO3.2.41................0.19.............5.5...............5.13.........Poor

YAG.......Y3Al5O12.......1.83....................0.028.............8.25...........4.60..........Poor

GGG.... .Gd3Ga5O12..... ..1.97.................0.045.............7................7.02...... ..Poor
CubicZirconia.ZrO2.......~2.2....................~0.06..........~8.3..............~5.7..........Poor Moissanite....SiC..............2.648................0.104...........8.5...............3.2..........High

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Natural minerals that (when cut) optically resemble white diamonds are rare, because the trace impurities usually present in natural minerals tend to impart color. The earliest simulants of diamond were colorless quartz, topaz and beryl (goshenite); they are all common minerals with above-average hardness (7–8), but all have low RIs and correspondingly low dispersions. Well-formed quartz crystals are sometimes offered as "diamonds," a popular example being the so-called "Herkimer diamond". Topaz's SG (3.50–3.57) also falls within the range of diamond.
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From a historical perspective, the most notable natural simulant of diamond is Zircon. It is also fairly hard (7.5), but more importantly shows perceptible fire when cut, due to its high dispersion of 0.039. Colorless zircon has been mined in Sri Lanke for over 2,000 years; prior to the advent of modern mineralogy, colorless zircon was thought to be an inferior form of diamond. It was called "Matara diamond" after its source location. It is still encountered as a diamond simulant, but differentiation is easy due to zircon's anisotropy and strong birefringence (0.059). It is also notoriously brittle and often shows wear on the girdle and facet edges. Much less common than colorless zircon is colorless scheelite. Its dispersion (0.026) is also high enough to mimic diamond, but although it is highly lustrous its hardness is much too low (4.5–5.5) to maintain a good polish. It is also anisotropic and fairly dense (SG 5.9–6.1). Synthetic scheelite produced via the Czochralski process is available, but it has never been widely used as a diamond simulant. Due to the scarcity of natural gem-quality scheelite, synthetic scheelite is much more likely to simulate it than diamond. A similar case is the orthorhombic carbonate cerussite, which is so fragile (very brittle with four directions of good cleavage) and soft (hardness 3.5) that it is never seen set in jewelry, and only occasionally seen in gem collections because it is so difficult to cut. Cerussite gems have an adamantine luster, high RI (1.804–2.078), and high dispersion (0.051), making them attractive and valued collector's pieces. Aside from softness, they are easily distinguished by cerussite's high density (SG 6.51) and anisotropy with extreme birefringence (0.271).
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Desert Diamonds are also known as Saudi Diamonds, or sometimes Qaysumah Diamonds. They are natural, semi-precious stones from the same micro-crystalline family as Amethyst, smoky Topaz and Citrine. These unique, high-grade stones have physical properties that produce the appearance of the expensive carbon-based diamonds! DESERT DIAMONDS are FOREVER, just like their carbon diamonds cousin. They are guaranteed not to discolor or break with age. This is the huge advantage of owning Dessert Diamonds vs. cubic zirconia. Compared with the carbon-based stones, which have a hardness factor of 10 on the Mohs scale, the Desert Diamond are only rated at a mere 7.0 on the Moh's Scale!
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Due to their rarity fancy-colored diamonds are also imitated, and zircon can serve this purpose too. Applying heat treatment to brown zircon can create several bright colors: these are most commonly sky-blue, golden yellow, and red. Blue zircon is very popular, but it is not necessarily color stable; prolonged exposure to ultraviolet light (including the UV component in sunlight) tends to bleach the stone. Heat treatment also imparts greater brittleness to zircon and characteristic inclusions. Another fragile candidate mineral is Sphaerite (zinc blende). Gem-quality material is usually a strong yellow to honey brown, orange, red, or green; its very high RI (2.37) and dispersion (0.156) make for an extremely lustrous and fiery gem, and it is also isotropic. But here again, its low hardness (2.5–4) and perfect dodecahedral cleavage preclude sphalerite's wide use in jewelry. Two calcium-rich members of the Garnet group fare much better: these are grossularite (usually brownish orange, rarely colorless, yellow, green, or pink) and andradite. The latter is the rarest and most costly of the Garnets, with three of its varieties—topazolite (yellow), melanite (black), and demantoid (green)—sometimes seen in jewelry. Demantoid (literally "diamond-like") especially has been prized as a gemstone since its discovery in the Ural Mountains in 1868; it is a noted feature of antique Russian and Art Nouveau jewelry. Titanite or Sphene is also seen in antique jewelry; it is typically some shade of chartreuse and has a luster, RI (1.885–2.050), and dispersion (0.051) high enough to be mistaken for diamond, yet it is anisotropic (a high birefringence of 0.105–0.135) and soft (hardness 5.5). Discovered in the 1960s, the rich green tsavorite variety of grossular is also very popular. Both grossular and andradite are isotropic and have relatively high RIs (ca. 1.74 and 1.89, respectively) and high dispersions (0.027 and 0.057), with demantoid's exceeding diamond. However, both have a low hardness (6.5–7.5) and invariably possess inclusions atypical of diamond—the byssolite "horsetails" seen in demantoid are one striking example. Furthermore, most are very small, typically under 0.5 carats (100 mg) in weight. Their lusters range from vitreous to subadamantine, to almost metallic in the usually opaque melanite, which has been used to simulate black diamond. Some natural spinel is also a deep black and could serve this same purpose.
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Because Strontium Titanate and glass are too soft to survive use as a ring stone, they have been used in the construction of composite or doublet Diamond simulants. The two materials are used for the bottom portion (pavilion) of the stone, and in the case of strontium titanate, a much harder material—usually colorless synthetic Spinel or Sapphire—is used for the top half (crown). In glass doublets, the top portion is made of almandine Garnet; it is usually a very thin slice which does not modify the stone's overall body color. There have even been reports of diamond-on-diamond doublets, where a creative entrepreneur has used two small pieces of rough to create one larger stone. In Strontium Titanate and Diamond-based doublets, an epoxy is used to adhere the two halves together. The epoxy may fluoresce under UV light, and there may be residue on the stone's exterior. The garnet top of a glass doublet is physically fused to its base, but in it and the other doublet types there are usually flattened air bubbles seen at the junction of the two halves. A join line is also readily visible whose position is variable; it may be above or below the girdle, sometimes at an angle, but rarely along the girdle itself. The most recent composite simulant involves combining a CZ core with an outer coating of laboratory created amorphous diamond. The concept effectively mimics the structure of a cultured pearl (which combines a core bead with an outer layer of pearl coating), only done for the diamond market.
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So again, get to know your jeweler or gemologist and don't be fooled by unknown vendors, salespersons and especially eBay and other auction sellers without having a chance to check-out the item completly yourself, with return rights.
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