投资的话钻石应该不保值，现在人工能合成了，只是Debeer把着不让流入市场

但是去年Debeer已经松口了，人工钻石价格只有天然的10%，将来只会更低

http://www.mining.com/de-beers-selling-diamonds-less-industry-isnt-happy/

“A 1-carat man-made diamond sells for about $4,000 and a similar natural diamond fetches roughly $8,000. De Beers new lab diamonds will sell for about $800 a carat. That’s a fifth of the price of existing man-made stones and one-tenth of the cost of buying a similar natural gem.”