We'll start with 14k and 18k gold. Both of these metals are exquisite for engagement rings. Both of these gold alloys are much less expensive than platinum. 14k gold, either it be yellow or white, has a 58.33% gold content and the rest of the alloy is other harder metals such as nickel, copper, palladium or zinc. On the other hand, 18k gold, either it be white or yellow has a gold content of 75% with the rest of the metal or alloy compound being other hard metals. So, 14k gold, either it be white or yellow, is harder than 18k gold, therefore, being a more gather choice for diamond engagement rings. Platinum on the other hand is very rare and it's the hardest(60% more dense than gold) jewelry metal.
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