What is a buff top cabochon?
By Jared James · Last updated 21 May 2026
Definition
A buff top cabochon is a hybrid cutting style where the upper portion of the stone, the crown, is smoothly domed and uncut in the traditional cabochon manner, while the lower portion, the pavilion, is faceted. This gives the stone a softer, rounded appearance from above while still allowing light to interact with the faceted underside, which can improve colour and brightness in stones that benefit from it. It is used on gems like star rubies and sapphires, cat's eyes and some coloured stones where the optical phenomenon is best seen through a dome but the stone benefits from some faceting below.
Frequently asked questions
- What is the difference between a buff top and a regular cabochon?
- A regular cabochon has a smooth dome on top and a flat or very shallow base, with no faceting at all. A buff top cabochon also has the smooth dome but adds facets to the pavilion, so it is a blend of the two cutting styles.
- Which gemstones are commonly cut as buff top cabochons?
- Star sapphires, star rubies, alexandrites, cat's eye chrysoberyls and some coloured tourmalines and garnets are commonly seen in buff top cuts. The style suits any stone where you want the optical effect of a cabochon but also want the added colour depth that faceting can bring.
- Is a buff top cabochon valuable?
- Value depends on the gemstone species and quality rather than the cut style itself. A fine star sapphire in a buff top can be extremely valuable. The cut is chosen to preserve or enhance the stone's best features, and a well-executed buff top in a quality stone is considered an elegant and purposeful choice.
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