Blue chalcedony (extra) Malawi, Ngabu (Africa), 7-16 grams

Mass finishing cost per gram without a choice.

With the choice, selection in size, weight and other parameters, the cost will be 45 rubles per gram.
Size from 20 mm to 34 mm.
Weight from 7 to 16 grams
The cost of a stone without a choice from 245 to 560 rubles.
The cost of a stone with a choice from 315 to 720 rubles.
Any stone can be "dressed" in a special spring for the stone(holder),so you get a ready pendant.

www.livemaster.ru/item/32005533-materialy-dlya-tvorchestva-pruzhinki-dlya-kamnya-krupnye-pod-serebristye.
www.livemaster.ru/item/32008713-materialy-dlya-tvorchestva-pruzhinki-dlya-kamnya-krupnye-pod-zolotistye..

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Blue chalcedony is represented as a mass finishing"extra"and has a fairly good quality data has high hardness,beautiful color ( color of blue,bluish grey, blue) and also has full or partial translucence.
For Malawian chalcedony is characterized by almost complete translucency and a minimum of bands and contrast in contrast to the Namibian blue chalcedony.
The name 'sapphirine' is a common trade term or rather a jewelry brand,rather than a name used by negligent sellers to attract attention and sell the stone more profitable.
In fact, sapphire is a very rare gem and in jewelry stores is almost not found and of course does not apply to blue chalcedony.