Superb 9-carat yellow gold aquamarine and diamond ring, with 3 square aquamarine stones and 4 small round diamonds.
Total weight 3.0gm
Aquamarines measure approx 4 mm 
Ring measures 5.5 mm at its widest point 
Width of shank 2.4 mm 
Ring size O 1/2
Real aquamarine stone
Identifying a real aquamarine stone is by looking at its colour. In its natural form, they have a pale blue colour, which is similar to seawater. They may have a slight green or yellow tint as well. Naturally occurring gems have excellent clarity and transparency.
How can you test an aquamarine?
Whether you use natural sunlight or artificial light, hold the stone up and look at the way the light passes through it. Real aquamarine is typically transparent or translucent, meaning that light should be able to pass through it relatively easily. If the stone appears opaque or cloudy, likely, it's not real.