Sapphire Price

Sapphire (Greek: σάπφειρος; sappheiros, 'blue stone', which probably referred instead at the time to lapis lazuli) is a gemstone variety of the mineral corundum, an aluminium oxide (α-Al₂O₃). Trace amounts of other elements such as iron, titanium, chromium, copper, or magnesium can give corundum blue, yellow, purple, orange, or a greenish color. Chromium impurities in corundum yield a pink or red tint, the latter being called a ruby.

Commonly, sapphires are worn in jewelry. Sapphires may be found naturally, by searching through certain sediments (due to their resistance to being eroded compared to softer stones) or rock formations. They also may be manufactured for industrial or decorative purposes in large crystal boules. Because of the remarkable hardness of sapphires—9 on the Mohs scale (the third hardest mineral, right behind diamond at 10 and moissanite at 9.25 on the Mohs scale)—and of aluminium oxide in general, sapphires are used in some non-ornamental applications, including infrared optical components, such as in scientific instruments; high-durability windows; wristwatch crystals and movement bearings; and very thin electronic wafers, which are used as the insulating substrates of very special-purpose solid-state electronics (especially integrated circuits and GaN-based LEDs).

Sapphire Price:

A question we frequently hear from customers is, "How much is a good sapphire?" It's not an easy question to answer because there are many different grades and colors of sapphire. Prices depend on carat weight as well. Still, it's a question worth answering, so here is our best attempt to answer it, based on our experience in the market.
Let's start at the lower end of the market and work upwards. The most inexpensive sapphires are carvings, since that's what the industry does with lower grade material that isn't suitable for gemstones. Carvings tend to be priced by the piece rather than the carat, since the work that goes into making them usually exceeds the cost of the material. You'll find small carvings starting at $10-20 per piece.

Next up in price are sapphire cabochons. Material of good color which is not sufficiently transparent to cut in facets is used to create the domed shape known as cabochon (or cab for short). You'll find these most often in blue and green, and they are often available in larger sizes as well, often up to 10 or 20 carats. The price per carat on the cabochons tends to be constant regardless of size, and we often have them at around $10 a carat. They can make some very attractive jewelry that has all the virtues of sapphire at a very affordable price.

You'll also find star sapphires in the cabochon-grade material. Here in Thailand we see several kinds of star sapphires. Our home province of Chanthaburi produces the untreated black and gold star sapphires found nowhere else in the world. We also have blue star sapphires that are diffusion treated with titanium to improve the star effect. Most of the star sapphires sell for around $10 a carat. Rare transparent star sapphires do exist but you'll find them mainly in museums.

Moving to faceted sapphire, the lower priced pieces will either be small sizes (under half a carat), heavily included material, or beryllium-treated. Prices for faceted sapphire start at about $20 a carat and rise according to size and color. In sizes greater than 1 carat you'll find clean beryllium-treated green sapphire at around $75 a carat, and yellow and red-orange pieces at around $100 to $120 a carat. We've noticed that the prices for beryllium-treated sapphire have been rising significantly in the last year.

Prices for heated blue sapphire depend very much on color and clarity. You can expect to pay around $300 a carat for clean pieces in the 1-2 carat size with good color saturation. Prices typically go up substantially for quality sapphire over 2 carats. We've had some excellent 2-2.5 carat blue sapphires at around $400 a carat and recently acquired a 5.09 carat Madagascar sapphire with IF clarity that is priced at around $600 a carat.

It is more difficult to state typical market prices for very fine unheated sapphire, since they are so rare. But we recently acquired two outstanding pieces from the Diego-Suarez mine in northern Madagascar. One piece is a stunning violet blue, 2.62 carats in weight and VVS clarity. It is a beautifully cut round, a shape that typically commands a premium in the market. We priced it at $965, which is probably unusually low for the market. A second unheated piece is a 6.33 carat rich blue with a hint of green, with a clarity grade of IF. It's priced at $5575. Generally you won't find fine unheated sapphire of any size at prices under $1000 a carat.

(source: Gemselect)

Almandine Garnet Stone

Almandine garnet, sometimes referred to as almandite garnet, belongs to the very vast and popular mineral group of garnet. Almandine is the most common of all garnet varieties. Although there are very large amounts of almandine sourced from all over the world, only a small percentage of the stones mined are of gem quality. Most almandine stones are opaque and rough, which means that they are only used for industrial purposes. Garnet stones are often used for sandblasting in the industrial sector.

The word 'garnet' is derived from the Latin word "granatus", which means grain, because many garnet deposits are small grains of red crystals in or on their host rock. The specific name of almandine originates from the name alabandicus which is the name of a stone found in the small town of Alabanda, located in Caria, the second smallest province of Asia Minor. Almandine occurs in a range of reds from dark brownish to purplish red and is a very popular gem choice for jewelers due to the excellent hardness (7.5 on the Mohs scale) and brilliance resulting from its high refractive index. Almandine garnet is often cut en cabochon with convex faces, and these specimens are sometimes referred to as carbuncles. Carbuncle is an old term used to describe any type of red gemstone cabochon. Red gemstone cabochons have historically been used as friendship gems. Garnet is also January's birthstone.

Almandine garnet can be difficult to distinguish between other garnet types by appearance alone, as well as other red stones. Almandine garnet will typically have darker tones compared to other red gems, but top quality specimens do have red colors similar to that of ruby. A strong neodymium magnet will be able help distinguish garnet from other gemstones. Measuring a stone's magnetic susceptibility in collaboration with its refractive index can be used to distinguish specific garnet species and varieties, and it can also determine the percentage of composition in hybrid variety garnets.

Buying Almandine Garnet

Almandine garnet gemstones can be found in many origins and sources including Brazil, India, Madagascar, Sri Lanka and the United States. Smaller deposits exist in Austria and the Czech Republic. Almandine garnet star gemstones are found in India and the United States. Idaho is known to be a very large source for star garnet gems. Amandine found in Sri Lanka is sometimes referred to as Ceylon ruby.

Almandine Garnet Color

Almandine garnet colors can range from pure red, reddish orange and slightly purplish red to dark brownish red. The unique deep red color of almandine is a direct result from the presence of iron.
Almandine garnet with pure, deep red colors are the most desirable and valuable of almandine stones.

Almandine Garnet Clarity and Luster

Almandine garnet has a vitreous luster. Gem quality almandine garnet is translucent, but depending on the cut, some stones may appear to be more translucent to opaque. Most almandine garnet rough is opaque and not considered to be of gem quality. These specimens are typically used for various industrial purposes.

Almandine Garnet Cut and Shape

There are abundant amounts of very large sized almandine garnet crystals, but because of their dark tones, only small to medium sized gems are faceted. When faceted, they are often cut slightly shallow to allow light to pass through them. Some garnet stones when cut en cabochon can display an asterism effect; these are referred to as star garnets. Almandine garnets can be found in a wide variety of shapes and cut styles including round, oval, pear, heart and trillion facet or cabochon stones.
(source:  Gemselect.com)

Ruby Stone

A ruby is a pink to blood-red colored gemstone, a variety of the mineral corundum (aluminium oxide). The red color is caused mainly by the presence of the element chromium. Its name comes from ruber, Latin for red. Other varieties of gem-quality corundum are called sapphires. The ruby is considered one of the four precious stones, together with the sapphire, the emerald and the diamond. 

Prices of rubies are primarily determined by color. The brightest and most valuable "red" called blood-red, commands a large premium over other rubies of similar quality. After color follows clarity: similar to diamonds, a clear stone will command a premium, but a ruby without any needle-like rutile inclusions may indicate that the stone has been treated. Cut and carat (weight) are also an important factor in determining the price.

Rubies have a hardness of 9.0 on the Mohs scale of mineral hardness. Among the natural gems only moissanite and diamond are harder, with diamond having a Mohs hardness of 10.0 and moissonite falling somewhere in between corundum (ruby) and diamond in hardness. Ruby is α-alumina (the most stable form of Al₂O₃) in which a small fraction of the aluminium³⁺ ions are replaced by chromium³⁺ ions. Each Cr³⁺ is surrounded octahedrally by six O^2- ions. This crystallographic arrangement strongly affects each Cr³⁺, resulting in light absorption in the yellow-green region of the spectrum and thus in the red color of the gem. When yellow-green light is absorbed by Cr³⁺, it is re-emitted as red luminescence.^[2] This red emission adds to the red color perceived by the subtraction of green and violet light from white light, and adds luster to the gem's appearance. When the optical arrangement is such that the emission is stimulated by 694-nanometer photons reflecting back and forth between two mirrors, the emission grows strongly in intensity. This effect was used by Theodore Maiman in 1960 to make the first successful laser, based on ruby.

All natural rubies have imperfections in them, including color impurities and inclusions of rutile needles known as "silk". Gemologists use these needle inclusions found in natural rubies to distinguish them from synthetics, simulants, or substitutes. Usually the rough stone is heated before cutting. Almost all rubies today are treated in some form, with heat treatment being the most common practice. However, rubies that are completely untreated but still of excellent quality command a large premium.

Some rubies show a three-point or six-point asterism or "star". These rubies are cut into cabochons to display the effect properly. Asterisms are best visible with a single-light source, and move across the stone as the light moves or the stone is rotated. Such effects occur when light is reflected off the "silk" (the structurally oriented rutile needle inclusions) in a certain way. This is one example where inclusions increase the value of a gemstone. Furthermore, rubies can show color changes—though this occurs very rarely—as well as chatoyancy or the "cat's eye" effect.

Factors Affecting Values

Diamonds are graded using criteria that have become known as the four Cs, namely color, cut, clarity and carat weight. Similarly natural rubies can be evaluated using the four Cs together with their size and geographic origin.

Color: In the evaluation of colored gemstones, color is the most important factor. Color divides into three components; hue, saturation and tone. Hue refers to "color" as we normally use the term. Transparent gemstones occur in the following primary hues: red, orange, yellow, green, blue, violet. These are known as pure spectral hues.^[11] In nature there are rarely pure hues so when speaking of the hue of a gemstone we speak of primary and secondary and sometimes tertiary hues. In ruby the primary hue must be red. All other hues of the gem species corundum are called sapphire. Ruby may exhibit a range of secondary hues. Orange, purple, violet and pink are possible.

The finest ruby is best described as being a vivid medium-dark toned red. Secondary hues add an additional complication. Pink, orange, and purple are the normal secondary hues in ruby. Of the three, purple is preferred because, firstly, the purple reinforces the red making it appear richer.^[11] Secondly, purple occupies a position on the color wheel halfway between red and blue. In Burma where the term pigeon blood originated, rubies are set in pure gold. Pure gold is itself a highly saturated yellow. Set a purplish-red ruby in yellow and the yellow neutralizes its complement blue leaving the stone appearing to be pure red in the setting. (wikipedia.org)

Marty Natalegawa: Mandela Pejuang Menumpas Ketidak Adilan

Meninggalnya mantan Presiden Afrika Selatan Nelson Mandela tak hanya membawa duka mendalam bagi masyarakat Afrika Selatan, tetapi masyarakat dunia. Menteri Luar Negeri RI Marty Natalegawa selain menyampaikan belasungkawa juga turut berduka. Menurut Marty, Mandela adalah tokoh dunia yang berjuang menentang ketidakadilan.

"Nelson Mandela adalah seorang tokoh yang menjadi inspirasi di seluruh pelosok dunia, khususnya negara berkembang, untuk menentang rasisme, kolonialisme, dan berbagai bentuk ketidak adilan lainnya," ujar Marty dalam siaran pers melalui pesan elektroniknya, Jumat (6/12/2013).

Karena itu, Marty dan seluruh masyarakat dunia tentu sangat merasa kehilangan sosok Mandela. Selama ini belum ada sosok yang secara teguh dan prinsipal menentang kebijakan politik apartheid. "Kita semua merasakan duka yang sangat mendalam atas wafatnya seorang tokoh dan pejuang yang secara teguh dan prinsipil menentang kebijakan apartheid yang keji," ujar Marty.

Mandela meninggal dunia pada usia 95 tahun setelah menjalani perawatan karena infeksi paru-paru selama 3 bulan belakangan. Dalam pernyataan yang disiarkan stasiun TV nasional Afrika Selatan, Presiden Jacob Zuma mengatakan Mandela 'pergi dengan damai'.

"Bangsa kita kehilangan putra terbaiknya," kata Zuma seperti yang dilansir BBC, Jumat 6 Desember.

Sejak keluar dari rumah sakit, kantor kepresidenan Afrika Selatan berulang kali menyebutkan kondisi tokoh peraih Nobel Perdamaian tahun 1993 dan terpilih sebagai presiden kulit hitam pertama Afrika Selatan tahun 1994 ini dalam keadaan kritis namun stabil.

Pink Star Diamond Has Sold For US$. 83 Million

A diamond known as the Pink Star has sold for $83m (£52m) at auction in Geneva - a record price for a gemstone. The diamond measures 2.69cm by 2.06cm (1.06 inches by 0.81 inches) and is set on a ring.

The Pink Star was sold to Isaac Wolf, a well known New York diamond cutter who has renamed it the Pink Dream.

The winning bid surpasses the $46.2m paid for the Graff Pink diamond three years ago, which was half the size of the Pink Star.

The $83m includes Sotheby's commission.

The winning bid was for 68m Swiss francs ($74m) and reports say there was a long silence between that offer and the previous telephone bid of 67m Swiss francs.

"Ladies and gentlemen, 68 million is the world record bid for a diamond ever bid and it's right here," Sotheby's David Bennett said as he brought down the hammer.

Sotheby's played the theme tune from the "Pink Panther" movie after the winning bid was confirmed.

Origins

According to the auctioneer, the Pink Star was mined by De Beers in Africa in 1999, but it did not say which country.

"It's really extraordinarily rare," said Mr Bennett.

"Very, very few of these stones have ever appeared at auction."

It took two years to cut and polish the diamond, which was 132.5 carat in its rough state.

In its finished condition the Pink Star is 59.60 carat, more than double the size of the next biggest diamond in its class.

A carat is a weight measurement used for gemstones and is 0.2g (0.00705 ounces).

Sotheby's has sold almost $200m worth of jewellery in its current auction, a record for a single auction according to the company. (BBC)

Giant Pink Diamond Auctioned For US$. 83 Million

How To Check If Your Diamond Is A Fake

Diamond Care

Since your diamond is a valuable investment, you’ll want to take proper care of it. This section contains some basic tips to help keep your diamond looking its best.

Diamond Care Do’s

Diamonds must be kept clean and stored carefully when they are not being worn. Here are some guidelines to help keep your diamond in top condition:

If you notice loose stone settings or any other noticeable damages to your jewelry, do not continue to wear the jewelry. Take it to a trusted, professional jeweler who can make an assessment and repair the jewelry. We recommend that you have a jeweler check the setting in your diamond ring, stud earrings or solitaire pendants (while you watch) once a year.

Blue Sapphire

Sapphire The blue sister of ruby. Ruby and sapphire are the same material, the mineral corundum, and the second hardest gemstone after diamond. Red corundum is known as ruby, while all other colors are referred to as sapphire. While blue is the classic sapphire color, sapphire is actually found in a wide range of colors.

 

Sapphire colors
Blue is the most famous of the sapphire colors. The prized Kashmir and Burmese sapphires have a deep blue that is intense and velvety. These sapphires are not often seen on the market today. Sri Lankan and Madagascar sapphires are the most common today, with a wide range of colors from light sky blue to dark blue. Other producers of blue sapphire are Australia, Tanzania, Thailand, Cambodia, and the USA (Montana).