Blue Sapphire Gemstones

Blue Sapphire gemstones ----------------------------------------- In this video, you can see some collections of blue sapphire gemstones. These come from Sri Lanka which is one of famous places in the world for natural blue sapphire gems. This video displays gemstone’s weight from about 1 carat to 54 carats. Also, it has various style of cut / shapes such as oval mixed, cushion, modified brilliant, rectangular cushion, oval, etc. Color has some range from intense cornflower blue to vivid blue / royal blue. All stones species is natural corundum. Also, they are un-heated blue sapphire. Blue sapphire is one of the corundum varieties out of two types. Blue is defined in terms of hue, saturation and tone. Sapphires have various colors such as blue, purple, violet, green, yellow, pink, white, etc. However, blue is common it has signifying place among other colors. Blue sapphires with up to 15% violet or purple are generally said to be of fine quality. The color of fine blue sapphires may be described as a vivid medium dark violet to purplish blue where the primary blue hue is at least 85% and the secondary hue no more than 15%, without the least admixture of a green secondary hue or a gray mask. ---------------------------------------- Category: Oxide mineral Formula: Aluminium oxide, Al2O3 Crystal system: Trigonal Fracture: Conchoidal, splintery Mohs scale: 9.0 hardness Melting point: 2,030–2,050 °C Mineral: Corundum

Видео Blue Sapphire Gemstones автора Thought-Provoking Experiments