A 15 carat diamond ring is an extraordinarily rare and valuable piece of jewelry, with prices varying dramatically based on factors such as cut, color, clarity, and market demand[1]. The price for a 15 carat diamond can range widely—from approximately $150,000 for a minimal quality stone to as much as $15–20 million or more for the highest quality examples[1]. Most listings for high-grade stones place them in the hundreds of thousands to several million dollars[4]. For example, a 15.12 carat J color, VS2 clarity, ideal cut diamond was recently listed at $276,768, while a 16.11 carat I color, VVS2 clarity, ideal cut diamond was priced at $664,145[4]. Another example is a 15-carat emerald cut, F color, VVS1 clarity, GIA-certified diamond engagement ring in platinum offered at $415,000[5].
There is no fixed price for such a ring, as the remaining three of the “4 Cs”—cut, color, and clarity—play a crucial role in determining value after carat weight is set[1]. Shape and dimensions are also vital, since different shapes can appear larger or smaller at the same carat weight[1]. In general, the value of a diamond increases exponentially with size, and price comparison tools are recommended for such high-value purchases[1]. Shopping online can sometimes yield lower prices compared to in-person purchases[1].
When evaluating a 15 carat diamond ring, experts consider:
- Cut quality – the craftsmanship in shaping the diamond, which affects brilliance and value.
- Color – the degree of colorlessness, with less tint increasing value.
- Clarity – the number and visibility of internal or surface imperfections.
- Shape – which affects perceived size and price per carat.
Because 15 carat diamonds are extremely rare, their prices are often described as belonging to the highest tier of the diamond market, with top examples fetching several million dollars at auction or through high-end jewelers[6].
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