That is a very very good question. Many people think platinum is a better metal. Sure it's worth more. But that's about it. Here are my pros and cons about platinum, 18 kt and 14 kt.
Ive been in this industry for so many years, so I've seen how metals wear out. Customers come back for repairs, sizing, refinishing etc.
Let me give some info on yellow gold and white gold.
14k yellow gold is 58.5% gold And mixed with other metals
18k yellow gold is 75% gold and mixed with other metals and has a more brassy color. This gold is not that popular in the US because of the brassy color.
14k white gold is actually yellow gold mixed with nickel and other metals to get the white color and same with 18 k
Platinum is mostly 95% pure
I know you wrote 18k yg but I'm confused with that because you ask about platinum which is white in color so I'm going to give you info on white gold
and not yg when it comes to wear and tear
Platinum stays white. As you wear it, It scratches up a lot and looks dull. It's also not as strong as you think. I have customers who bring their rings in to clean and it's not even rounded anymore. The shank gets banged up a lot and becomes flattened. And if there's diamonds or other stones involved, when it comes to repairs, it's not easy. Platinum takes a lot of heat to work with so the jeweler may have to take the stones out to repair unless the have a laser machine. The dullness of the platinum makes the ring look so ....worn. Can't find the right word. Hehehe.
18k wg and 14k wg stays shiney as you wear it. Since the wg is basically yellow gold mixed with nickel, it will turn slightly yellowish as you wear it. And repairs are much easier. But if you're using white gold, there's really no point to request 18k, it will just turn yellowish faster since it has 75% gold in it. But it's definitely fine to use it.
Platinum pros: feels heavy and it stays white
Platinum cons: get very scratched up and dull, not easy to repair. And when I say scratched up , trust me the scratches aren't little lines or marks, they are DEEP scratches. I always describe platinum like oatmeal. It's dense and heavy but soft. Sure it can be polished but do you know how much of the platinum the polisher has to take off before it gets smooth ? It will just eventually thin
out.
14k and 18k white gold pros: stays shiney, easy to repair.
14k and 18k white gold cons: turns yellowish. Can always be refinished and look white again.
At the end of the day, both metals need refinishing eventually no matter what.
As far as setting diamonds in platinum, sure it's perfectly fine, I just don't like how the platinum dulls out and the prongs start getting flattened from wearing.
I prefer prong setting. There might be some confusion on what people think pave setting really means. A pave band can have tiny prongs and that's what makes it look nice and sparkly. Or the diamonds are set INTO the ring and beads are raised to hold the stones in. Bad part about that type is that the stones are usually buried and it doesn't shine as much. But not in all cases.
If you send me a picture of what you were thinking, I can definitely give my opinion.
As far as scratching your ering, it depends if you have stones set on the side. But honestly, don't worry about that. Everything scratches. Just get it polished.