As with other chemical reactions, the reaction rate and efficiency of PCR are affected by limiting factors. 1  Thus, the entire PCR process can further be divided into three stages based on reaction progress: 2  Exponential amplification: At every cycle, the amount of product is doubled (assuming 100% reaction efficiency).
Quick Answer. Aquamarine forms when magma under the Earth's crust interacts with mineral-rich rocks under mountain ranges. The magma cools as it enters fissures and crevasses of rocks called pegamites. The minerals in the pegamites heat up when they interact with the magma, forming the gemstone. Continue Reading.
In the commercial market, aquamarine competes with treated blue topaz for attention, but fine aquamarine sells for far more than equivalent-quality treated blue topaz. Color. Aquamarineâs color range is very narrow: It can be blue, very slightly greenish blue, greenish blue, very strongly greenish blue, or green-blue.The gemâs most valuable color is a dark blue to slightly greenish blue with moderately strong intensity.In general, the purer and more intense the blue color, the more valuable the stone. Most aquamarine is a light greenish blue.Although some buyers prefer the more greenish natural color, most of the aquamarine in the market was heat-treated to give it more of a pure blue. Fashioned aquamarines often have to be fairly largeâgenerally over 5 caratsâto show intense, dark color.ost aquamarine is a light greenish blue. Although some buyers prefer the more greenish natural color, most of the aquamarine in the market was heat-treated to give it more of a pure blue. Fashioned aquamarines often have to be fairly largeâgenerally over 5 caratsâto show intense, dark color.