Turquoise Jewelry

Where the name comes from: French pierre turquoise - "Stone from Turkey", while there was a significant amount of trading the stone that went on in Turkey, it originated from nearby countries and regions.
Where the stones come from: Iran, Sinai, USA, sometimes it is a by-product from large copper mines.
Chemistry: A hydrous phosphate of copper and aluminium, CuAl6(PO4)4(OH)8.4H2O
Colors: Sky blue through paler blue to blue-green, the bluer forms are more sought after and more valuable.
...and another thing: Turquoise is rather sensitive to physical damage and also can be changed by cosmetics, heat, oils (including those in the skin, so it should be touched as little as possible) and even bright lights.

Prices correct at time of writing - subject to change
Kate Spade New York Beaded Women
Kate Spade New York Beaded Women's Necklace Women's Necklace Turquoise, Gold-Plated/Cubic Zirconia/Brass
On sale - now $73 - was $71.54
Kendra Scott Mini Elisa Satellite Short Pendant Women
Kendra Scott Mini Elisa Satellite Short Pendant Women's Necklace Women's Necklace Gold Turquoise Magnesite
On sale - now $73 - was $39.99
Kendra Scott Mini Ellie Stud Women
Kendra Scott Mini Ellie Stud Women's Earrings Earring Gold Turquoise Magnesite, Brass/Gold-Plated
On sale - now $78 - was $43.11
Kendra Scott Ari Heart Short Pendant Women
Kendra Scott Ari Heart Short Pendant Women's Necklace Women's Necklace Gold Turquoise
On sale - now $83 - was $49.5
Kate Spade New York Anklet Women
Kate Spade New York Anklet Women's Bracelet Turquoise, Brass
On sale - now $90 - was $52.2
Kate Spade New York Solitaire Women
Kate Spade New York Solitaire Women's Bracelet Women's Bracelet Turquoise, Brass/Stainless Steel
On sale - now $100 - was $58
Kate Spade New York 6Mm Square Pendant Women
Kate Spade New York 6Mm Square Pendant Women's Necklace Turquoise, Cubic Zirconia
On sale - now $100 - was $58