Startup Idea: Gemstone Price Comparison App

Startup idea to develop an app that aggregates international gemstone prices and compares them to the USD price. The solution could include a database or an automated graph showing the fluctuations in gemstone prices globally. Additionally, a visually engaging website might show different gemstones and their price denominations.

I am a jewelry salesperson. My store does appraisals for a variety of stones,including sapphires. When international customers come in,they are disappointed to find out their appraisals is worth way less in the US than their in home country. I'm searching for an app or some way to aggregate international prices for gemstones and compare them to the USD price. We lose a lot of jewelry sales due to this. The demand for certain gemstones in one country may be nonexistent in another and we need a database to reflect that. An ideal solution would be a database or maybe a automated graph showing the rise and fall of the price gemstones across the world python. Maybe a colorful website showing all the different gemstones and their prices in different denominations. I've looked but only have found charts showing certain gems,like sapphire or opal.