Quartz cabochon doublet circle

Quartz cabochon doublet circle

color: " Aventurine honey yellow", "Aventurine blue", "Aventurine green", "Opal"
Size: " Aventurine honey yellow" d13.5, h8; " Aventurine blue" d14, h9; " Aventurine green" d13,5, h8; " Opal" d14, h7;
In the comments to the order, write the color you need.

The price for the Aventurine honey-yellow doublet cabochon is 1058,20 rubles. in the presence of 52 PCs.
The price for the Aventurine blue doublet cabochon is 1058,20 rubles. in the presence of 30 PCs.
The price for the Aventurine green doublet cabochon is 1058,20 rubles. in the presence of 6 PCs.
The price for the cabochon doublet "Opal" is 1527,90 rubles. in the presence of 32 PCs.

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Duplets of stones, obtained from two components, were known in ancient Rome.
Why put the stone on the substrate?
The substrate is used to strengthen the cabochon. For example, brittle minerals: chrysocolla, malachite, fluorite, if a thin cabochon of them is not reinforced with a substrate, the stone can crack.
Duplets are also used to reveal the beauty of the stone. Moss agate is planted on a glass substrate for beauty. The stone cutter, leaving a thin layer with a pattern, emphasizes the pattern of the stone, makes it clearer and more transparent.
In the cabochon of opal, they often resort to processing in the form of a doublet. The doublet is a thin plate of opal, glued to a substrate of durable natural stone. In the doublet, the upper side of the doublet is covered with another additional plate, usually made of transparent quartz, which practically forms the upper surface of the domed cabochon, aimed at protecting the opal from mechanical damage and as a magnifying glass that enhances color effects. All this makes it possible to produce cabochons from a material that would otherwise not be suitable for jewelry purposes due to the small thickness and / or insufficient strength.