2, size, the size of the gem is inseparable from the price, and the high-quality ruby of more than one carat will have a high price. High-quality rubies above 3 carats and pigeon blood red above 1 carat are all worthy of collection, and there is a high room for appreciation.
3. Cleanliness: The cleanliness of ruby refers to some mineral inclusions and gas-liquid inclusions generated internally during the formation of ruby, which mainly affects its fire and transparency, and cracks also affect its safety.
When selecting rubies, in daily selection, some flawless or slightly flawed rubies only have some defects on the edges, and basically no defects can be seen as long as they are inlaid.
4. Cutting, the shape of ruby crystal determines the cutting method. The most common shapes of rubies are oval and pillow, round, drop-shaped and olive-pointed, but large and good quality are rare.
5. Origin: Myanmar is the most famous ruby producing area. Almost all the top rubies are produced in Myanmar, among which the rubies produced in Gumu and Su Meng are the most famous. Many of the best "pigeon blood red" are produced here. Pure and rich in color, red as blood, with a very beautiful "fluorescence sense", relatively poor purity, more inclusions, but high price.
Extended data:
Characteristics of ruby:
1. Ruby refers to red corundum, which is a kind of corundum and belongs to cubic system and complex cubic crystal. The crystal shape is often barrel, short column, plate and so on. Aggregates are mostly granular or dense blocks.
2. Transparency: transparent to translucent.
Gloss: Bright glass luster to sub-diamond luster.
4. Luminescence: Ruby has obvious-weak red fluorescence under long-wave and short-wave ultraviolet irradiation.
5. Polychromaticity: Dichroism is obvious, often manifested as: purplish red/brownish red, crimson/red, red/orange red, rose red/pink.
Second, the way to distinguish and identify:
1 and red garnet
(1) Garnet is isotropic and has no polychromatic color, while ruby has obvious polychromatic color.
(2) Under ultraviolet lamp, ruby has red fluorescence, while garnet is inert.
(3) The interior of garnet is relatively clean, and there are abundant gas-liquid inclusions and solid inclusions in ruby.
2, with red spinel
(1) spinel is isotropic and colorless.
(2) The refractive index is lower than that of ruby.
(3) When examined under magnification, spinel has octahedral negative crystals arranged in beads.
3. Red tourmaline
(1) tourmaline has more obvious polychromatic property.
(2) Faceted gems can see the ghost of the edge of the back facet in a proper direction.
4. Andalusite
(1) andalusite has a strong polychromatic color visible to the naked eye, and the colors are brownish yellow-green, brownish orange and brownish red.
(2) Andalusite has no moderate green and yellow-green fluorescence under short-wave ultraviolet light, while ruby has no moderate red fluorescence.
(3) Ruby has obvious chromium absorption line in the red zone.
5, with red glass
(1) Red glass is isotropic and has no polychromatic properties.
(2) Zoom in and check that bubbles and vortex lines can be seen in the red glass.
(3) It has a typical conchoidal fracture with obvious ridgeline.
(4) Glass has a low density and feels very light to handle.
Baidu Encyclopedia-Ruby