Platinum is a white metal, but unlike gold it is used in jewellery in almost its pure form (approximately 95% pure). Platinum is extremely long wearing and is very white, so it does not need to be Rhodium plated like white gold.
Platinum is a very dense metal, so a platinum ring will feel heavier than an 18kt gold ring.
Platinum is, however, very expensive. A platinum ring will be approximately twice the price of an 18kt white gold ring.
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