Daisys and Diamonds
Super_Ideal_Rock
- Joined
- Apr 30, 2019
- Messages
- 24,565
I’m assuming you mean to compare Amethyst with a purple sapphire?
The main differences are hardness, sapphire is corundum so it’s 9 on Mohos scale Whereas Amethyst is a form of Quartz with a hardness around 7.5.
Sapphire also has a higher refractive index so it sparkles” (returns light) better.
There is quite a huge difference is price and size availability. Large Amethyst crystals are very common and available in just about any carat weight you want for $10 or less a carat.
Sapphire crystals are rarer, much smaller and very much more expensive. A purple sapphire over 10 carats would cost many thousands of dollars, whereas a cut Amethyst gem of 10 carats, maybe $100.
I was never a fan of ammys but I always wanted a big one like yours with what I call the Royal Purple color. Stunning. Alas, stones of that quality are not inexpensive and I could never justify the price for a semi precious gem and give it the high carat yellow gold setting it deserved. So I have to admire from afar... your pendant is stunning!
Another perk to having an amethyst over sapphire is that lapidaries can make all sorts of wonderful and ingenious cutting designs with them. With sapphire, they’re rarely ever recut or precision cut, and if so, you’re not going to get a large stone with a fancy precision cut design.