This diamond ring has a semi-Klado, which is valuable in weight; But the color and clarity are not good. Diamonds with K color are slightly yellowish on white copy paper, but they are not visible on hands (D color is the best, D, E, F and G are colorless, and H, I, J and K are colored). In terms of price, I personally think it should be expensive compared with quality.
The key to jewelry is that you like it, especially the style and effect. Your satisfaction is the most important thing. Moreover, the price of this luxury goods changes with the general environment and is not accurate.
As far as things are concerned, I hope I didn't make you unhappy!
It seems that you are curious to know how much it should be worth. I will quote the price of a diamond pendant I bought at the end of last year (12,09) for your reference: the round natural diamond of 18K platinum set bought by Chow Tai Fook in Hong Kong, weighing 0.50 kcal, J color, S 1 clarity, with GIA certificate and diamonds.