by 
The Curious Bag
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<h4 class="dechead">On One Hand: Sphene is Brittle
Sphene is a beautiful yellow-green gemstone that is mined in a wedge shape. It's also commonly known as titanite, due to its high titanium content. The Mohs scale of hardness rates stones on a scale of 1 to 10, and sphene rates a 5. So unlike a diamond, sphene is very brittle, and thus is vulnerable to damage from acid and harsh cleansers.
On the Other: The Gem is Brilliant
Sphene is a rare gem whose brilliance is greater than even a diamond, and it can disperse more variegated colors, such as red or blue. Beautiful sphene rings can be made, although it's difficult to locate a jeweler willing to manufacture or sell a piece that could be so easily damaged.
Bottom Line
It's hard to resist the rare, yellow-green brilliance of sphene. The chances of damaging the stone is little as long you're careful to remove it before any strenuous activity. But in order to preserve your sphene stone's shape and luster and prevent it from being damaged, it's wiser to save it for a necklace brooch or earring rather than a ring.
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