Method for assessing the sapphires and rubies

Identification of Sapphire:

Natural blue color is often uneven, straight growth of most lines. Synthetic sapphire the same color, its growth patterns for the curved, often visible in vivo have bread crumb or beaded bubbles.
Natural Sapphire also Dichroic, from one direction, blue, look for blue-green from the other direction. Other gems are different from natural blue color, which can be distinguished.
In addition, the most simple method of determination of hardness, scratched on a natural Blue Topaz, Blue Topaz-gem in the scratched, so when buying jewellery, such as no cash instruments, as long as there is a Topaz, but it can solve some of the problems.
“Added Sapphire”

Sapphire’s English name is Sapphire, comes from the Latin Spphins, meaning blue. Sapphire mineral known as corundum, a mineral corundum family. At present gem outside of Ruby, the other variously colored gem-quality corundum are called Sapphire.
Sapphire’s chemical composition is aluminium oxide (Al2O3), because it contains trace elements ti (Ti4+) or iron (Fe2+) is blue. Three-party system. Often tubular morphology, short columnar, tabular, and geometry as granules or dense block. Transparent to translucent, shiny glass. Refractive indexes, 1.76, 1.77, birefringence 0.008 and strong Dichroism. Non-homogeneous body. Sometimes with special optical effect-Starlight effect. Hardness of 9, density of 3.95-4.1 g/cm3. No cleavage, crack development. Under certain conditions, you can have a beautiful six-shot star, known as “star sapphire.”
Sapphire can be divided into blue sapphires and bright color (blue) Sapphire. Color to India “cornflower blue” is the best. Sapphires are said to protect the King and the monarchy from harm, “the stone of the Kings,” said. International gem Sapphire was designated as “September birthstone”, a symbol of love, loyalty and constancy.
Ruby methods:
Natural stone “ten crack red nine”, without any defect and cracking of natural Ruby is extremely rare. Synthetic Ruby color, defects or less crystalline inclusions, clean, large blocks. As precious gems on the market over 3 carats of natural Ruby is rare, encounter a large block of Ruby, to attract attention, because natural Ruby correspondingly greater higher value than faux rubies and little oversight, “medicine”.
Natural rubies have a strong “dichroic”, the so-called Dichroic, that seen from a different direction, with shades of red and orange-red two, if there is only one color may be red spinel, Garnet or red glass.
Natural Ruby Red Spinel is very similar to the two most confusing, so it must be particularly careful.
“Added Ruby”
Ruby’s English name is Ruby, comes from the Latin Ruber, meaning red. Ruby mineral known as corundum.
Chemical constituents of Ruby aluminium oxide (Al2O3), because it contains trace element chromium (Cr3+) into a red to pink. Three-party system. Morphology is often in barrel, short columnar, tabular, and so on. Aggregates for granular or compact block. Transparent to translucent, shiny glass. Refractive indexes, 1.76, 1.77, birefringence 0.008 – 0.010. Dichroism of obvious and non-homogeneous. Sometimes with special optical effect-the star effect, light is reflected under the charming six shooting stars, known as the “six-line”. Hardness of 9, density of 3.95 to 4.10 g/cm3. No cleavage, crack development. Ruby on long and short wave ultraviolet irradiation issued red and dark red fluorescence.
Ruby Red, the most valuable is the most concentrated, is called ‘ pigeon blood ‘ gem, very valuable. This almost could be called dark red bright strong colors, true colors show clear Ruby. Unfortunately most of the Ruby-red color is pale and feeling with the powder, with shades of Ruby pigeon blood, more valuable. As Ruby filled with intense anger and gaudy colors, people used to think it was the personification of dead birds, their wishful fantasies. Natural Ruby origin non-scarce, high quality Ruby only a production in Myanmar, and production is gradually reduced, and can now say, virtually incapacitated, a large stone would no longer appear.
Evaluation and purchase of Ruby. Ruby color is the primary assessment and purchasing factor, followed by weight, transparency and clarity. In General, color purity, particle size, transparency, and none or very few inclusions and blemishes, fine processing, parts in proportion to faceted rubies for superior quality. Burmese Ruby, pigeon blood red, color, transparency, and large size, very few defects and cracks. Sri Lanka’s rubies, light color, the main species are the Star Ruby. Thailand pointed bamboo pattern Ruby, deep red color not so bright and clean. Ruby has a brittle, percussion, beats, wear should pay attention to.