"platinum level" is correct and can be used in written English.
It refers to a high or top level of quality, status, or achievement. Example: "The hotel offers a luxurious stay with amenities and services at the platinum level."
He isn't on the platinum level of athlete donors.
And when he was a few miles shy of maintaining his platinum level in Northwest Airlines' frequent-flier program, she called the airline to maintain his benefits.
In 2017, our program was designated a Platinum Level Center of Excellence in Life Support by the Extracorporeal Life Support Organization (ELSO).
The prices and the benefits range from platinum level, which is the most expensive and covers the most costs, to bronze, the least expensive plan.
In early November, Ward Village received the platinum level certification for eco-friendliness in neighborhood development from the United States Green Building Council.
Given that the requirements for operation are a computer, a platinum level frequent flyer status, and a subscription to a few research services, this seems unlikely.
A We go for silver, gold and platinum levels on projects we design, and we're looking to exceed that.
American Airlines offers separate lines at O'Hare, near Chicago, and San Diego for Aadvantage frequent flier program members who are at the gold, platinum and executive platinum levels, as well as for first- and business-class international passengers.
My guess is those four guys looked at their mileage statements and saw a million miles total increase, which, of course, includes a large amount of bonus miles at the gold and platinum levels".
We have designed a loco-regional delivery system to increase platinum levels in the lymphatics, where early metastasis is most likely to occur, while reducing systemic toxicities.
"We have bronze, silver, and gold," a chatty, unconcerned girl who looked like she was in high school said to the two friends seated next to her. "We have silver, gold, and platinum levels, but no bronze.
