I have purchased several items from a jeweler that I love and feel comfortable with. There is a pair of earrings that i want that are mostly gold with a little platinum disc that holds a small number of small round diamonds as part of the design. I would like the earrings to be done custom--so made exactly as they are designed except another part of the earring to be platinum so that the earring goes from about 85% gold to about 70% gold and 30% platinum. I am wondering how this would affect the price of the earrings? Are the prices of platinum and gold pretty close these days? Are there any additional labor costs with platinum? Remember the diamond weight and entire design remain exactly the same. (There are three distinct pieces that are attached to make the whole. Two gold and one (tiny) platinum. The custom pair would go to one gold -largest piece--and two [platinum). Hope this makes sense.