What is the Star 129 diamond cut?
By Jared James · Last updated 21 May 2026
Definition
The Star 129 cut is a round brilliant diamond cut with 129 facets rather than the standard 57 or 58, achieved by adding extra facets to both the crown and the pavilion. More facets create smaller, more numerous reflections, which produces a distinctive pattern of tiny, lively sparkle points rather than the larger, bold flashes of a standard round brilliant. Cuts with this many facets are proprietary designs produced by specific cutting houses, and they appeal to buyers who prefer a very intense, fine-grained scintillation.
Frequently asked questions
- Does more facets mean more sparkle?
- More facets create more but smaller reflections, which gives a busier, more intricate sparkle pattern. A standard 57-facet brilliant is engineered for maximum light return and bold fire. Whether 129 facets looks better is a matter of personal taste; neither is objectively superior.
- Is the Star 129 cut available from any jeweller?
- It is a proprietary cut, meaning it is produced and sold by specific licensed cutting houses rather than being a generic style. You would need to source it through a jeweller who carries or can order that particular cut.
- How does the Star 129 compare to a standard brilliant cut diamond?
- Both are round and designed to maximise light performance, but the additional facets in the Star 129 produce a finer, more intricate sparkle pattern. The standard brilliant is more widely available and easier to compare using GIA or AGS grading reports.
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