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These blue sapphire rough stones come from Africa.
It can be made as cabochon and bead for jewellery items.
Weight: 140 g = 0.31 pound (4.9 ounce)
(each piece is from 8 to 35 gram, about 6 to 11 pieces in one lot)
The pictures in the listing are just for reference as we are selling multiple lots with same pictures.
***
Sapphire
Sapphire 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)—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).
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.
Identification | |
Color | often blue, but varies |
Crystal habit | massive and granular |
Crystal system | Trigonal |
Fracture | conchoidal, splintery |
Mohs scale hardness | 9.0 |
Luster | vitreous |
Streak | white |
Specific gravity | 3.95–4.03 |
Optical properties | Abbe number 72.2 |
Refractive index | nω=1.768–1.772 |
Pleochroism | strong |
Melting point | 2,030–2,050 °C |
Item Specifics | |
---|---|
Shape : | Rough |
Brand : | Unbranded |
Country of Manufacture : | Tanzania |
Variety/Type : | Blue |
Transparency : | Opaque |
Cut Grade : | Good |
Country of Origin : | Tanzania |
Country/Region of Manufacture : | Tanzania, United Republic of |
Gemstone Type : | Sapphire |
Gemstone Color : | Blue |
Gemstone Creation : | Natural |
Gemstone Form : | Rough |
Gemstone Treatment : | Not Enhanced |
Gemstone Shape : | Natural |
Item Length : | NA |
Item Depth : | NA |
Item Width : | NA |
Certification : | NA |
Gemstone Clarity Grade : | Eye Clean |
Number of Pieces : | 6 to 11 |
Gemstone Effect : | Iridescence |
Wholesale : | No |
Vintage : | No |
California Prop 65 Warning : | NA |
MPN : | NA |
By Paypal
Free shipping cost.
We send the goods to USA, Canada, UK, Australia, New Zealand, EU countries and some other European and Asian countries by E-express, a kind of fast postal service by Hong Kong Post. It usually takes about 6 to 10 working days for delivery.
We send the goods to other countries by registered airmail and will take about 8 to 14 working days for delivery.
Returns: We accept returns with any reason in 30 days.
We will answer buyer messages within 24 hours during working days.
Selltotheworld
From all around the world
Natural Sapphire Rough Stone from Africa 8 to 35 g small pieces 140 gram Lot
These blue sapphire rough stones come from Africa.
It can be made as cabochon and bead for jewellery items.
Weight: 140 g = 0.31 pound (4.9 ounce)
(each piece is from 8 to 35 gram, about 6 to 11 pieces in one lot)
The pictures in the listing are just for reference as we are selling multiple lots with same pictures.
*** Sapphire Sapphire 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)—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). 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.
Payment
By Paypal Shipping
Free shipping cost. We send the goods to USA, Canada, UK, Australia, New Zealand, EU countries and some other European and Asian countries by E-express, a kind of fast postal service by Hong Kong Post. It usually takes about 6 to 10 working days for delivery. We send the goods to other countries by registered airmail and will take about 8 to 14 working days for delivery. Returns
Returns: We accept returns with any reason in 30 days. Contact Us
We will answer buyer messages within 24 hours during working days. All right reserved. |
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