Turquoise
Turquoise takes its characteristic blue tones from the copper present within the stone. The colour of turquoise can range from china blue through to dark blue greens and yellow green. Hardness and depth of colour are the two factors in determining the value of turquoise; while colour is a matter of individual taste, generally speaking, the most desirable is a strong sky to "robin's egg" blue. The mother rock or matrix in which turquoise is found can often be seen as splotches or a network of brown or black veins running through the stone; this veining may add value to the stone if the result is complementary
View Turquoise Jewellery at Astley Clarke
Turquoise Turquoise 5 - 6
Sky blue to greenish colour and frequently contains patches or veins of dark matrix