Can turquoise be cut into the shape of a round diamond and used in an engagement ring?

Turquoise generally gets a cabochon cut, which means a round or oblong smooth dome shape when used in jewelry. Giving turquoise a round diamond cut is possible, but really there is no point to giving turquoise a faceted diamond cut. Diamonds have facets in order to maximize the reflection and refraction of light entering the diamond, which gives diamonds their sparkle and fire. Since turquoise is not a reflective stone, there's no point in giving it a faceted round diamond cut. It is technically possible, but a faceted cut would not maximize the beauty of turquoise like it increases a diamond's beauty and quality. You can use a turquoise gemstone in an engagement ring if you really want to, but it's not a particularly good idea. Turqouise is not as resilient as diamonds are because it is a much softer stone. It is far more given to scratching, and your turquoise ring would need to be polished frequently to maintain its shine. A faceted cut turquoise engagement ring would also be much harder to polish than a regular cabochon cut. Aside from its relative softness, turquoise is a porous gem, which means it is sensitive to moisture and humidity. All in all, I wouldn't recommend getting a turquoise engagement ring. If you're set on the color, why don't you instead opt for a turquoise colored diamond engagement ring? A three-stone diamond engagement ring with a turquoise diamond in the center flanked by white diamonds on either side would be just gorgeous.

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Turquoise can be cut into the shape of a round diamond, however, a turquoise engagement ring won't hold up well as a diamond engagement ring since turquoise has a lower hardness level, so it will scratch and damage easily. You'd have to constantly take it to be re-polished, and you would may even have to have it re-cut on occasion in order to maintain its shiny reflective surface, especially if you plan to wear the turqouise ring every day.

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Turquoise can be used in an engagement ring, however you should protect it constantly, especially since engagement rings tend to be worn every day so they're prone to a lot of wear and tear. Don't allow any water come in contact with the turquoise stone, avoid exposing the ring to extreme temperatures or harsh chemicals, clean it only with a very soft cloth, and prevent it from getting scratched.

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