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- Purity: “Gold jewelry is often 14-karat to 18-karat, while platinum is usually at 90 percent to 95 percent purity,” says Reilly. “This makes it completely hypoallergenic,” says Reilly. (See “Hypoallergenic,” above).
- Rarity: Reilly described platinum as simply being rarer. Both gold and platinum occur in rare quantities in the earth’s crust — 0.004 parts per million and 0.005 parts per million, respectively. However, gold is mined in much higher quantities than platinum, resulting in fewer platinum supplies.
- Enduring quality: When platinum is scratched, the material is displaced instead of being chipped away. This leads to less loss of material.
- Feel of weightiness: Pure platinum (21.45g/cm3) has a higher density than pure gold (19.32g/cm3). This makes platinum rings heavier. “Heft is a luxurious feel,” states Reilly. “You want something that you know you can feel on your finger.”
- Emotional response that it elicits: Reilly notes that platinum wedding rings elicit stronger emotional responses than other rings. “When you receive a gift that’s perceived to be more valuable, the more emotional the response will be,” he says.
- Real whiteness: Platinum is white by default while gold is yellow. Gold has to be alloyed to achieve whiteness and even then, it will eventually fade to a creamy yellow but platinum stays white.
- Security with which it can hold a diamond: Among jewelers, platinum is known to have the least “metal memory” among precious metals. This means that platinum prongs are less likely to lose their secure grip on the diamonds compared to gold prongs. (See “Platinum Shape Memory,” below, right).



