How to Compare Gem Values?
The comparison of several well-known gemstones based on their estimated financial values is shown in the chart below. While some varieties, like alexandrite, sapphire, and ruby, are rare and expensive due to their high demand, others, like ruby, can range greatly in price from affordable to priceless. Generally speaking, the higher the clarity, size, and beauty of the color, the higher the price.
What are the Optical Variations of a Gemstone?
Every gem possesses a diverse range of optical characteristics, both in terms of color and clarity. These factors, along with the gem's refractive index (RI), specific gravity (SG), hardness, luster, and dichroism, must all be taken into consideration by the gemologist during identification.
