Are three-stone rings more expensive than solitaires?

Diamond pricing is exponential by carat weight, not linear, because larger rough crystals are rarer than smaller ones and have to be cut more carefully to preserve weight. A 1ct G VS1 round natural runs roughly AU$7,000 to AU$12,000 per carat in 2026, while a 2ct stone of the same grade runs closer to AU$13,000 to AU$20,000 per carat. A single 2ct solitaire therefore costs significantly more than a 1ct centre with two 0.5ct side stones of the same quality, even though the total carat weight is identical. The split delivers a visually comparable ring at a meaningfully lower stone cost.

The cost advantage flips on three scenarios. Large fancy-cut side stones, like trillions over 0.4ct or tapered baguettes cut to match an oval centre, are made in lower volumes and carry a meaningful per-carat premium over standard rounds. Mixed-shape combinations also push the price up because the side stones often have to be sourced as a custom matched pair rather than pulled from stock parcels. And a 2.5ct or 3ct centre with side stones above 0.75ct each puts you back into exponential pricing territory on all three stones. For most budgets under AU$25,000 the three-stone format still comes out cheaper than a single-stone equivalent.