[custom_adv] It’s the thought that counts, we know, but we wonder what sort of thoughts were going on in the minds of these women when their fiancés opened the box to reveal one of these lovely rings inside. How about $2.5 million? That’s 10-carat diamond ring that Michael Douglas gave to Catherine Zeta Jones. Surprisingly, the most expensive ring in our list belongs to Elizabeth Taylor but the “cheapest” ring in our list belongs to Kate Middleton, the Duchess of Cambridge. It’s only about $137,200. 10. Kate Middleton & Prince Williams Brand: Garrard 18-Carat Blue Sapphire White Diamond Price: $137.200 [custom_adv] 09. Anna Kournikova & Enrique Iglesias ( fiancé ) Brand: Argyle Jewellers Pink Pear-Cut Price: $ 2.5 Million [custom_adv] 08. Catherine Zeta Jones & Michael Douglas ( husband ) Brand: Fred Leighton Vintage Diamond Price: $ 2.5 Million [custom_adv] 07. Jacqueline Onsassis & Aristotle Onassis ( second husband ) Brand: Lesotho lll Diamond Price: $2.6 Million [custom_adv] 6. Melania Knauss & Donald Trump ( husband ) Brand: Graff Emerald- Cut Diamond Price: $ 3.0 Million [custom_adv] 5. Jennifer Lopez & Marc Anthony ( ex husband ) Brand: Neil Lane Blue Diamond Price: $ 4.0 Million [custom_adv] 4. Grace Kelly & Prince Rainier lll of Monaco ( husband ) Brand: Cartier Emerald- Cut Diamond Price: $ 4.06 Million [custom_adv] 3. Paris Hilton & Paris Latisis ( ex- fiancé ) Brand: Gold Diamond-Encrusted Price: $ 4.7 Million [custom_adv] 02. Beyonce & Jay-Z ( husband ) Brand: Lorraine Schwartz Price: $ 5 Million [custom_adv] 01. Elizabeth Taylor & Richard Burton ( Twice her husband, in 1964 and 1975 ) Brand: Asscher-Cut Krupp Diamond Price: $ 8.8 Million