Based on the information you provided, I think PT 950 diamond ring is good. As for the brand, it doesn't matter if you haven't heard of it, because every diamond ring has a jewelry appraisal certificate. Diamonds have 4C standard: 1. Weight is a fraction. 2. clarity (VVS, VS, Si). 3. color. 4. stop. In other words, the greater the diamond score, the whiter the color (except colored diamond). The higher the definition, the higher the price of standard cutting.