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Cut Sapphire

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Original price $80
Current price $75

Bright blue color of cut Sapphire of different sizes and shapes.. 

Price per carat: 75 $ per carat (12,000 PKR per carat)

Total number of stones in the lot: 34

Total Weight of all the Sapphires: 50 carats

Total Price of the whole lot: 3,750 $ (600,000 PKR)

Origin: Srilanka

Color: Blue


34 stones of different sizes, shapes and beautiful red color.

 

 

You can also buy one stone of your choice for 75 $ per carat (1,200 PKR).

 

 

SAPPHIRE

Sapphire is a precious gemstone, a variety of the mineral corundum, consisting of aluminum oxide (α-Al2O3) with trace amounts of elements such as iron, titanium, chromium, vanadium, or magnesium. It is typically blue, but natural "fancy" sapphires also occur in yellow, purple, orange, and green colors; "parti sapphires" show two or more colors. Red corundum stones also occur, and are not called sapphires, but rubies. Pink colored corundum may be either classified as ruby or sapphire depending on locale. Commonly, natural sapphires are cut and polished into gemstones and worn in jewelry. Because of the remarkable hardness of sapphires – 9 on the Mohs scale (the third hardest mineral, after diamond at 10 and Moissanite at 9.5) – sapphires are also used in some non-ornamental applications, such as infrared optical components, high-durability windows, wristwatch crystals and movement bearings, and very thin electronic wafers, which are used as the insulating substrates of special-purpose solid-state electronics such as integrated circuits and GaN-based blue LEDs.

Sapphire is the birthstone for September and the gem of the 45th anniversary. A sapphire jubilee occurs after 65 years.

Sapphire is one of the two gem-varieties of corundum, the other being ruby (defined as corundum in a shade of red). Although blue is the best-known sapphire color, they occur in other colors, including gray and black, and they can be colorless. A pinkish orange variety of sapphire is called padparadscha.

 

Blue sapphires

Gemstone color can be described in terms of hue, saturation, and tone. Hue is 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).

 

Sapphires of other colors

Sapphires in colors other than blue are called "fancy" or "parti colored" sapphires.

Fancy sapphires are often found in yellow, orange, green, brown, purple and violet hues.

Particolored sapphires are those stones which exhibit two or more colors within a single stone.

Colorless sapphires have historically been used as diamond substitutes in jewelry.

Pink sapphires

Pink sapphires occur in shades from light to dark pink, and deepen in color as the quantity of chromium increases. The deeper the pink color, the higher their monetary value. 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.

Padparadscha

Padparadscha is a delicate, light to medium toned, pink-orange to orange-pink hued corundum, originally found in Sri Lanka, but also found in deposits in Vietnam and parts of East Africa. Padparadscha sapphires are rare; the rarest of all is the totally natural variety, with no sign of artificial treatment.

Among the fancy (non-blue) sapphires, natural padparadscha fetch the highest prices.

Star sapphire

A star sapphire is a type of sapphire that exhibits a star-like phenomenon known as asterism; red stones are known as "star rubies". Star sapphires contain intersecting needle-like inclusions following the underlying crystal structure that causes the appearance of a six-rayed "star"-shaped pattern when viewed with a single overhead light source. The inclusion is often the mineral rutile, a mineral composed primarily of titanium dioxide.

 

GENERAL

Category

Oxide mineral

Formula

Aluminium oxide, Al2O3

Crystal system

Trigonal

Crystal class

Hexagonal scalenohedral (3m)
H-M symbol: (32/m)

Space group

R3c

IDENTIFICATION

Color

Typically blue, but varies

Crystal habit

As crystals, massive and granular

Twinning

Both growth twins (in various orientations) and polysynthetic glide twinning on the rhombohedron [1011

Cleavage

Poor

Fracture

Conchoidal, splintery

Mohs scale hardness

9.0

Luster

Vitreous

Streak

Colorless

Diaphaneity

Transparent to nearly opaque

Specific gravity

3.98~4.06

Optical properties

Abbe number 72.2

Refractive index

nω=1.768–1.772
nε=1.760–1.763,
Birefringence 0.008

Pleochroism

Strong

Melting point

2,030–2,050 °C

Fusibility

Infusible

Solubility

Insoluble

Other characteristics

Coefficient of thermal expansion (5.0–6.6)×10−6/K
relative permittivity at 20 °C
ε = 8.9–11.1 (anisotropic)