Opal is a magical gem with a cat's eye effect. When there is light shining on it, it will form a long strip of light on the surface of the gem, which is like a cat's eyes. Therefore, this phenomenon is called the cat's eye effect. There are many gemstones with a cat's eye effect in the gem world, but only the gold emerald with the cat's eye effect can be called the opal directly. Other gemstones with cat's eye effect can only add the word "cat's eye" after the gem name. High-quality opal is mainly produced in Sri Lanka, and there is also a small distribution in Brazil.
So how do you buy opal? There are many colors of opal, but mainly yellow color, the best color is honey yellow, others are yellow green, brown green, brown yellow, brown. In addition to the basic conditions such as color and carat number required for most gems, the quality evaluation of opal has a close relationship with its "cat's eye". Excellent quality opal requires the eyeliner to be straight and even, continuous and continuous, clear and not turbid, bright and not dark. As long as you meet these, it should be a collection of opals.
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