Black Tigers Eye
Black Tigers Eye Ornamental Stone
Superb piece of black tigers eye from South Africa, the slightly rounded face of this stone has been lightly polished and some great chatoyance can be seen when it catches the light at the right angle. This chunky ornamental piece displays a wide range of colours which include shades of red, brown, yellow, black and even blue. The particularly distinctive blue stripe that can seen in our first photo almost looks like a blue marker pen and we had to examine it under strong magnification to ensure that it wasn't. When tigers eye minerals are magnified their fibrous structure becomes visible and as light reflects off these parallel fibres it causes the optical phenomenon known as chatoyance. As the stone is gently moved back and forth the reflection of light causes both colour and markings to look like they're shimmering across the surface of the stone.
Most of the world's supply of tigers eye comes from Griqualand West in the Northern Cape, South Africa, a region that's also famous for the Kimberley diamond mine. Australia and the USA export large quantities of this popular variety of quartz and smaller quantities can also be found in several other countries around the world.
Tigers eye is a well known mineral often used as a gemstone, it tends to be cut as a cabochon and is often mounted in sterling silver. The grading of tigers eye is carried out according to a stone's colour with golden or honey brown and rich yellow being the most valuable. The quality of the chatoyance is also taken into consideration and this optical phenomenon can be reduced because of the direction of the fibres or any kinks or bends that may be present.
Weight (grams) : 376
Size (cms) : 10.2 x 7.1 x 3.4