Blue diamond rings are among the most exclusive and expensive jewelry pieces in South Africa, largely because of their rarity and the unique geological conditions required for their formation. The price of a blue diamond ring in South Africa depends on several factors such as carat weight, color intensity, clarity, and cut quality[5].
For smaller, commercially available blue diamond rings, typical prices seen at South African jewelers include:
- 0.05 carat: approximately ZAR 7,595
- 0.03 carat: approximately ZAR 9,836–10,410
- 0.04 carat: approximately ZAR 10,117
- 0.09 carat: approximately ZAR 13,638
- 0.1 carat: approximately ZAR 14,686–21,970
- 0.13–0.144 carat: approximately ZAR 16,542–20,663
- 0.445 carat: approximately ZAR 42,100
- 0.5 carat: approximately ZAR 27,937
These prices are for blue diamond rings set in 14k gold and can vary based on the specifics of the setting and stone[4].
For exceptional and investment-grade blue diamonds, prices increase dramatically. For example, a 0.12 carat fancy greyish blue diamond sold for about $4,800 (±R89,280), and a 0.15 carat fancy intense blue diamond sold for $10,500 (±R195,300). The per-carat price for the world’s most valuable blue diamonds can reach millions of dollars, with the most notable South African blue diamonds like the “Blue Moon of Josephine” (12.03 ct) selling for over $4 million per carat at auction. This sets a stark contrast between top-tier investment pieces and smaller, jewelry-grade stones[2].
The overall price range reflects both the rarity of natural blue diamonds and the significant demand among collectors and investors. Larger carat weights, vivid color grades (“Fancy Vivid Blue”), and flawless clarity dramatically increase the value, making auction prices for single stones soar up to $21.5 million (as recent as May 2025)[1].
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