I track this market closely. Here is the data and what it means for buyers today. January 2023: 1ct D-VVS1 lab round, IGI certified: approximately $3,800. June 2025: Same spec: approximately $2,010. 47% price decline in 18 months. Why this happened: • Lab diamond production (CVD process) has scaled massively — primarily from Indian manufacturers • Supply increased dramatically; demand grew but not at the same rate • Retailers who bought lab inventory 18 months ago are sitting on stock that has declined in value • The price floor is still falling — analysts expect continued decline through 2026 What this means if you are BUYING NOW: 1. For appearance-focused buyers: this is an extraordinary moment. A 2ct D-VVS1 lab round can be had for under $4,000. Six months ago that was $5,200. A year ago it was $6,800. 2. For buyers concerned about resale: the decline is already priced in. Lab diamonds now resell at 10–15 cents on the dollar and that ratio is unlikely to worsen dramatically — you are already near the floor of "commodity gemstone" pricing. 3. For natural diamond buyers: natural prices have held relatively steady. The gap between natural and lab has widened. A GIA 1ct G-VS1 natural costs roughly $4,800. The same spec in lab costs $1,900. That is a 2.5x multiple that did not exist 3 years ago. The buying advice right now: • If you are buying lab: prices may still fall. But "wait for lower prices" is a trap — there is no signal for when to stop waiting. • If you are buying natural: nothing has changed. Natural at good grades has been price-stable. • If you are undecided: the lab value case has never been stronger if appearance is your primary criterion.

Background: I work adjacent to the diamond trade and wanted to do an honest consumer-side comparison of the three major online retailers. I used store credits and returned two of the three stones within the return window. Here is what I found. The stone: GIA 1ct G-VS1 round, Excellent cut, no fluorescence. I found what appeared to be equivalent stones (similar proportions, same grade) at all three. BLUE NILE • Price: $5,210 • Packaging: elegant, secure, arrived in 3 days • Certificate: GIA report included digitally and as paper copy • Customer service: responsive, knowledgeable by chat • Stone quality: good. Proportions in the acceptable Excellent range. • Verdict: reliable, competitive pricing, good for buyers who know what they want JAMES ALLEN • Price: $5,480 (same spec) • 360-degree video: genuinely useful — I could see the actual stone I was buying, not a stock photo • Certificate: GIA digital only (paper available on request) • Customer service: 24/7 chat, responded in under 2 minutes • Stone quality: the video revealed a slight tilt in the table — not on the certificate, visible on video. I would not have caught this without the 360 view. • Verdict: the video technology is a real differentiator. Worth the slight premium to actually see your stone. WHITEFLASH • Price: $5,890 for their A-CUT-ABOVE® branded stone • Hearts & Arrows: genuine H&A pattern, verified with their ASET scope images • Light performance: measurably better than the other two in side-by-side • Customer service: a human called me within an hour of my inquiry. Not a chat bot. • Verdict: the best stone. Also the most expensive. If light performance is your priority and budget allows: Whiteflash. For most buyers: Blue Nile for price confidence, James Allen if you want to see the actual stone first, Whiteflash if you want the best cut execution regardless of price.