Sapphire and its identification

What's a sapphire?

Gem-grade steel jade (AI2O3) other than red, triangular crystal system. Ruby is a chromium element Cr element, 0.1~ 3%, showing red, containing other chromium elements or low-content Cr elements, showing other colors

How to identify gems?

1. Appearance

2. Put it to observe the inclusion

3. Instrument identification

Observe the appearance from the naked eye

Sapphire raw stone: a three-square crystal system, with barrel-shaped crystals as the main form. Column crystals and plate crystals can also be seen, and stripes of lateral growth are common on the crystal surface.

From the color: sapphire is rich in color, color ribbon is very developed, you can often see parallel or angular color ribbon, color ribbon ", part of the strong multi-color visible to the naked eye, blue, blue green, yellow green.

The luster of sapphire is much stronger.

Special Optical Effect: Six beams of starlight, twelve beams of starlight, never four-colored starlight. A few sapphires will change color.

Zoom in and observe the inclusion

Sapphire is relatively clean compared to red stone, but there are also some inclusions, the most common.

1. Fingerprint-like inclusions.

2. Three groups of directions: acupoint rutile, zircon, agglomerate bicrystals, hydroaluminite, etc.

Instrument detection

1. Refractive Index: 1.

2. Density 4.0g/cm3

3. Multicolor, depending on body color, medium-strong multicolor.

4. Fluorescence: Generally no fluorescence, under long wave: pink~ pink color and color-changing sapphire have red fluorescence, and some yellow sapphire apricot yellow fluorescence.