<![CDATA[We have an old ring that is approximately 3-4 carts, round cut set in 18k gold. The jeweler we took it to told us it was an alexandrite. The color changes from dark purple to deep green. I am not sure if it is a genuine natural stone or lab created - my guess would be lab or simulated since it is so large. Can you give me an idea on the approximate value of this stone/ring ?]]>