Usually platinum refers to platinum, but some merchants steal the concept of white metal as platinum.
The price of rubies is just like what is said upstairs. Larger brands are generally not cheap. I suggest that you should pay attention to asking clearly when buying jewelry in the future, and be careful not to be stolen by unscrupulous merchants. 18k gold is much more expensive than palladium, so it is normal that your current 18K necklace is much lighter than the previous palladium necklace ... Tips: Pay attention to maintenance when wearing diamonds. Don't wear it when doing housework and cooking. Be careful when you wear it. For a brand like Jinliufu, the price will definitely not be cheap. As for the palladium you mentioned, it's really not very valuable. More than 300 grams is really expensive, but the brand here can't pay. If you want to buy a brand, don't care about the price. If you want to buy something affordable, it is recommended not to consider the brand of the shopping mall. Instead, you can find some reputable online stores, preferably physical stores. The price is much cheaper than what you bought in the mall ~ ~ and the quality is guaranteed.