There’s not much to go on here, but it might not matter that much. I looked for 2ct+ I+ SI1+ diamonds under $18k. I didn’t like any of the G/H options, so that leaves us with I color. I think that’s fine since that’s typically fine for most people (https://www.diamondscreener.com/education/what-diamond-color-grade-should-i-buy/).
With that, I think you come in well under budget with something like the 2ct I VS1 below. Otherwise, you can go as big as 2.31 I VS1 while staying under budget.
Diamond List – Generated by diamondscreener.com
Shape,Carat,Color,Clarity,Cut,Price (USD),Affiliate Link