Introduction to Ruby


The July gemstone is Ruby, which is classified as a mineral in the Species Corundum, as well as Sapphire. Ruby is a red to purple-red corundum gemstone. Ruby has been dubbed as King of gems And believe that Ruby will protect its owner from misfortune. The word “Ruby” comes from the Latin word “Ruber”, originally “Rubinus” meaning red.
Ruby treasure
Chemical formula
Refractive index (RI)
Biological value (Birefringence)
Optical nature
Luster (Luster)
Crystal system
Specific gravity (SG) aluminum oxide (Al2O3)
Approximately 1.76-1.77
About 0.008-0.010.
Uniaxial double refractive index (DR)
Glass luster (Vitreous)
Three-axis azimuth system (Trigonal)
About 9
About 3.80-4.05
Birth processes and origin There are two types of genesis of ruby: primary And secondary
1. Primary Deposits This primary source of mineral origin It is often a gemstone found with the origin stone. It is often found as a rock-origin mineral or is produced as a foreign mineral, such as by gemstone in Mokok, Burma and by Madagascar. In general, this mineral source is found to be associated with rocks such as intrinsic igneous, metamorphic and alkaline basalt volcanic rocks.
2. Secondary Deposits This type of origin is related to the decay of the origin rock. And the ore is blown out of its source by the current to accumulate into a new mineral source Such as byproducts in Thailand This secondary mineral source. It can be divided into 2 types according to the accumulation of mineral deposits as follows: stationary byproduct source Or near the source Often found minerals around the hillside Or the area where the original rock has decayed Or being blown away from the same place in a short distance The gemstone found is often large. Mineral resources The mineral source is formed from the rock of the origin which has decayed. And caused the blow of the water stream Accumulates in lowlands such as sediment plains Bay of the river The gemstone found is usually small in size. Quality improvement Ruby is one of the most widely improved and widely recognized gems in the market. Most of the quality improvement of rubies is through thermal improvement method. In order to get rid of unwanted color additives Including making the gemstone more clear and clean


The color of ruby

A ruby ​​is a family of corundum that is red in color. The color of rubies can be of many shades. In which a large premium certificate Will specify the color of the ruby ​​as follows

– Pink-Red / Pinkish Red (red-pink)
– Purple-Red / Purplish Red (purple red)
– Orange-Red / Orangy Red (orange red)
– Red / Intense Red (Red / Intense Red)
-Vivid Red (bright red)
-Vivid Red – GGT color type “Pigeon’s Blood” (bright red with the color type is bloody)

GGT color type “Pigeon’s Blood”
“Pigeon’s blood red” is a bright red color known as the color of bird blood red. Which has an intermediate color tone There could be only a few blended shades of purple. This red-colored ruby ​​has a medium to high UV fluorescence.

The GGT color type “Pigeon’s Blood” will be specified on the certificate only for rubies that:
– It is genuine gemstone (not synthetic gemstone)
– It is a non-burnt gem or an old burnt gem
– Not a byproduct burn with beryl, lead or sunburst color.
– It is a gem of good quality and good proportion.

** For pomegranate with a bright red color. But the color tone is quite dark In large certificates, the Premium only indicates the color “Vivid Red”. This ruby ​​is darker red than the carmine ruby. And glow in the UV light very little

Lab notes
– Color of ruby ​​(RUBY)
– Pollucite
– Jadeite-Jade Type Identification and Analysis
– Quartz Crystal from the Himalayas
– The curvature of the pin in a rhodonite