5.7 cts 15x10x7mm African Amethyst loose faceted gemstone X475

Product Details

  • 5.7 cts 15x10x7mm African Amethyst loose faceted gemstone X475
  • x475
  • amethyst
  • $112.00 inc. tax

  • Units in Stock: 1

5.7 cts 15x10x7mm African Amethyst loose faceted gemstone X475 Summary

5.7 cts 15x10x7mm African Amethyst loose faceted gemstone X475


The gemstones in this ad are the gemstones you will receive

This is not a stock photo

100% Genuine and natural no treatment.

Mohs hardness 7

Refractive index 1.544-1.553

Critical angle 40°

Specific gravity 2.63-2.65

Cleavage None

Fracture Conchoidal, brittle.

Dispersion Medium (.013)

Heat sensitivity Low

Pleochroism Amethyst very weak (purple to grayish purple); Natural citrine weak (yellow to light-yellow); Prasiolite very weak (light-green to paler green); Rock crystal colorless, no dichroism; Rose quartz weak (pink to paler pink); Natural dark smoky definite (brown to reddish-brown).

Birefringence (double refraction) Weak (.009)

Crystal structure Hexagonal

Treatments Oro Verde, lemon citrine, smoketrine and most dark gray smoky quartz without any brown tones are all irradiated.  Citrines are often heat treated to improve color and give a reddish tint.  Most citrine is amethyst that has been heat treated.  Some smoky can be heated to create citrine.  Prasiolite is heat treated amethyst and citrine from one locality.

Cutting Quartz cuts easily.  Pre-polishing with 1200 Nubond or 3000 standard lap will make polishing much quicker and more enjoyable.

Polishing Cerium oxide on most common polishing laps.

General Gemstone Details
Quartz is a power stone, and has been called as well as considered world wide as the Universal Crystal.   It is the most recognized type of crystal, and what many people envision when the thought of crystal comes to mind.   In fact there are many different types of Quartz, in quite a variety of colors. 
Rock Crystal Encompasses a large family of stones and crystals, all of which are made up primarily of silicon dioxide, one of the most common and most important substances in the world. Crystals of pure Quartz, generally six-sided, can be found in all shades and colors. Quartz crystals grow singularly or in groups and take on different shapes according to the temperature at the time of their formation. Quartz crystals can also contain other minerals frozen within, as in Rutilated Quartz. Quartz can be formed of microscopic crystals and take on entirely different appearances and qualities. 

Quartz can be a bit of a confusing stone, as it encompasses a great many varieties that often are thought to be gemstones on their own, but are in fact another type of quartz.  As well, within the quartz family there are other stones, which have their own little families as well.  Here is a breakdown of the most common quartz varieties

Related Products

5.7 cts 15x10x7mm Afric..

5.7 cts 15x10x7mm Afric..

5.7 cts 15x10x7mm African Amethyst loose faceted gemstone X475 The gemstones in this ad are the gemstones...

African Amethyst facete..

African Amethyst facete..

Amethyst Dark faceted Loose oval cut 14x10x7mm 5.25 cts 796A Click here to see all faceted Amethyst Certified...

African Amethyst for sa..

African Amethyst for sa..

African Amethyst for sale 10x9x6mm 3 cts 0791C Certified 100% real not man made but genuine from the...

African Amethyst Loose ..

African Amethyst Loose ..

African Amethyst loose faceted cut for sale 5.7 cts 14x10 mm V95 Certified 100% real not man made but...

African Amethyst Loose ..

African Amethyst Loose ..

Loose African Amethyst Faceted for sale 5.6 cts 14x10x7 mm V410 Certified 100% real not man made but...

Sign Up for our Newsletter