No Heat Nigerian Blue Sapphire
|Main Stone:||Blue Sapphire (Corundum)|
|Sapphire Geographic Origin:||Nigeria|
|Sapphire Carat Weight:||6.77ct|
|Sapphire Cut:||Custom-Cut Oval by Shawn Maddox|
|Secondary Stone:||1.25cttw Natural Round Brilliant Cut Sapphires|
|Tertiary Stone:||0.85cttw Round Brilliant Cut Diamond G-H / VS|
|Metal/Karat:||14kt White Gold|
One of beautiful custom designs, this 14kt white gold ring features a custom cut, no heat blue sapphire from Nigeria. The sapphire was purchased directly from the mine and cut by lapidary Shawn Maddox. This ring also boasts 1.25cttw sapphires and .85cttw diamonds. This ring is truly one of a kind and highlights a standout natural blue sapphire.
The sapphire is one of the three gem-varieties of corundum, the other two being ruby – defined as corundum in a shade of red, and padparadscha – a pinkish orange variety. Although blue is their most well-known color, sapphires may also be colorless and they are found in many colors including shades of gray and black.
The cost of natural sapphires varies depending on their color, clarity, size, cut, and overall quality – as well as their geographic origin. Significant sapphire deposits are found in Eastern Australia, Thailand, Sri Lanka, China (Shandong), Madagascar, East Africa, and in North America in a few locations, mostly in Montana. Sapphire and rubies are often found in the same geographic environment, but one of the gems is usually more abundant in any of the sites.
Color in gemstones breaks down into three components: hue, saturation, and tone. Hue is most commonly understood as the “color” of the gemstone. Saturation refers to the vividness or brightness of the hue, and tone is the lightness to darkness of the hue. Blue sapphire exists in various mixtures of its primary (blue) and secondary hues, various tonal levels (shades) and at various levels of saturation (vividness).
Blue sapphires are evaluated based upon the purity of their primary hue. Purple, violet, and green are the most common secondary hues found in blue sapphires. Violet and purple can contribute to the overall beauty of the color, while green is considered to be distinctly negative. Blue sapphires with up to 15% violet or purple are generally said to be of fine quality. Blue sapphires with any amount of green as a secondary hue are not considered to be fine quality. Gray is the normal saturation modifier or mask found in blue sapphires. Gray reduces the saturation or brightness of the hue, and therefore has a distinctly negative effect.
The color of fine blue sapphires may be described as a vivid medium dark violet to purplish blue where the primary blue hue is at least 85% and the secondary hue no more than 15%, without the least admixture of a green secondary hue or a gray mask.
Sapphires of other colors
Yellow and green sapphires are also commonly found. Pink sapphires deepen in color as the quantity of chromium increases. The deeper the pink color the higher their monetary value, as long as the color is tending toward the red of rubies. In the United States, a minimum color saturation must be met to be called a ruby, otherwise the stone is referred to as a pink sapphire.
Sapphires also occur in shades of orange and brown. Colorless sapphires are sometimes used as diamond substitutes in jewelry. Natural padparadscha (pinkish orange) sapphires often draw higher prices than many of even the finest blue sapphires. Recently, more sapphires of this color have appeared on the market as a result of a new artificial treatment method called “lattice diffusion”.