The crystal structure of spinel is isometric, and its crystal habit is octahedral or twinned octahedral (macles) and to a lesser extent, cubic or dodecahedral. Red is the most valuable color, followed by orange red, pinkish red and purplish red. As the brightness of the color drops the price falls.
What birthstone is August?
What is a blue garnet?
Only reported in 2017, Blue Garnet is a rare and unusual sub-variety of an already rare Garnet, Color Change Umbalite, and despite its beauty, will always have an inadequate supply, making Blue Garnet highly collectable and very exclusive. Hardness 7 – 7.5. Refractive Index 1.760 – 1.765.
Are opals worth more than diamonds?
Getting your hands on opal is easy, but finding gem-quality opal is another story. Diamonds, on the other hand, fetch a high price even for the most low-quality diamonds. Why is value important? Because the value of most diamonds will be higher than opals, while high-quality opals are rarer than diamonds.
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