Prince Harry proposed to Meghan Markle over roast chicken. While the setting was low-key (for them), the ring was anything but. The now-famous three-stone diamond engagement ring is made up of one diamond from Botswana and two others from Princess Diana's personal collection. It was designed by Harry and made by court jewelers Cleave and Company. It has an estimated value of over $50,000 (£36,000) but, because of its fame, could sell for anywhere between $500,000 (£360,000) and $1 million (£700,000).. It will be her sixth proposal (she says), her fifth ring and her fourth engagement. That’s a lot of diamonds, you guys. All of her engagements have been with fairly high profile men so it stands . Lord Winston Talk at GSAL Professor Robert Winston Tells Students to Use Science Wisely. A small group of Year 12 students were invited to GSAL to hear Professor Robert Winston talk about the potential for science to be used or abused..