The writer argues that jewelry-grade diamonds, because they are both (i)____________ and (ii)____________, prove one of two conclusions: their purchasers have so much money they can spend it on goods that (iii)____________, or their purchasers are so committed to making others think they have such wealth that they are willing to go into debt to do so. A. flawless B. durable C. may appreciate in value D. fungible E. useless F. reflect the buyers' connoisseurship G. expensive H. irreplaceable I. serve no practical purpose