A 12 carat diamond ring is exceptionally rare, with its value primarily influenced by the diamond’s cut, color, and clarity in addition to carat weight[1]. The price range for a 12 carat diamond can vary enormously: refined stones generally cost between $100,000 to $1.5 million[1]. However, some exceptionally high-quality stones may fetch up to $12 million if priced at $1 million per carat[1].
Recent listings for round cut diamonds close to 12 carats show prices ranging from approximately $195,000 for a lower color and clarity grade up to over $1,050,000 for a high color and clarity grade[2]. For instance, a 12.02 carat, I color, VVS1 clarity diamond was listed at $341,485, while a 12.98 carat, D color, VVS2 clarity diamond was listed at $1,053,360[2].
Lab-grown 12 carat round diamonds are significantly more affordable, typically ranging from $4,500 to $25,500, with an average price around $11,500[4]. These offer a cost-effective alternative for those seeking size and brilliance without the premium of natural stones.
For those looking to purchase, both online retailers and physical jewelers sell such stones, and buying online can provide savings of 20%-40% compared to brick-and-mortar prices[1]. A specific example is a 9.7 carat, H color, VVS1 clarity round brilliant engagement ring listed at about $315,000 in 18K white gold[5].
The vast price range reflects the extreme importance of the 4Cs in diamond valuation. Even among stones of the same carat weight, factors like a flawless cut, perfect clarity, and premium color can multiply the stone’s price several times over[1].
Serious buyers should always request a certificate from a reputable gemological authority (such as GIA) to verify quality and authenticity before purchase[5].
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