Can you please tell me what gemstone this is?

Question

Hi, I'm sorry, but I can't provide you with a picture. My parents won't let me. :( My grandmother gave this ring to me the last time I saw her, she never told me what type of stone was in it. It has a sterling silver band, with a wrap around the stone. Really pretty designed clamps are holding the stone in place.

The stone itself is turquoise blue, with 3 brown hill-like lines, and a circle of brown (with blue in the center) at the bottom of the stone (or the top, depending on how I wear it.) When the gem hits the light, the brown turns into a green, barely lighter than forest green. And the blue becomes brighter. Do you have an idea of what this stone could be?

Answer 1

Your stone is probably agate

Answer 2

You know I was kind of interested in the gemstone that you described because it sounds like a beautiful piece to own... I did a little bit of researching and it sonds like you might have a Bisbee turquoise here is the link to one f the websites where I got a picture of what kind of ring you might own.....  

Answer 3

it's probably an agate with a turquoise covering.

RARE

Answer 4

compare with this gemstone

http://www.searchoptima.com/gr:gemstone....

Answer 5

The stone in your ring is turquoise.

http://en.wikipedia.org/wiki/Turquoise

The provided link shows a picture of the type of tone you have and matches the description.  

Answer 6

this could be a aquamarine