Interestingly enough, Amazon actually carries diamond jewelry over $100,000!!! Take a look at them below.
First is the 18k White Gold Necklace with 23.30ctw Oval and Pear Shaped Sapphires and 23.10ctw Diamonds.
Fourth is the 3.60ct Natural Untreated Burmese Ruby Platinum Ring with 1.44cts of Round Brilliant Diamonds.
The last one over $100k is the Pair of Magnificent Platinum, Cushion Sapphire and Diamond Earrings.