Gemstone Cut Guide: Which Shape for Which Stone
Why does the same amethyst look completely different as a round brilliant than as an emerald cut? Because the gemstone cut fundamentally alters a stone's light behavior. This guide explains the most important cuts, which stones benefit from which, and why some combinations are particularly beautiful.
What the cut does to the stone
The cut of a gemstone determines:
- Brilliance: Amount of white light reflected
- Fire: Colorful rainbow sparkle through light refraction
- Scintillation: Flashing sparkle of facets when moved
- Color depth: How intense the stone's color appears
A stone can appear to have different optical qualities simply due to the cut – regardless of its natural quality.
Round Brilliant
What it is: 57–58 facets in a round shape – optimized for maximum brilliance.
Best for: Diamonds and moissanite – the reflective properties of these stones are maximized. Also for sapphires and rubies.
Optical effect: Maximum fire and sparkle. The "most active" of all cuts.
Finger shape: Neutral – works on all finger shapes.
Oval Cut
What it is: Oval shape with similar facets to the brilliant cut.
Best for: Sapphires, rubies, emeralds, aquamarines, morganite. The oval cut elongates the stone and makes it appear larger than its actual weight.
Optical effect: Elegant, elongates the finger, very modern.
Why it's trending: Oval is the most chosen cut for engagement rings in 2025–2027.
Emerald Cut (Step Cut)
What it is: Rectangular with cut corners and parallel step facets instead of brilliant facets.
Best for: Stones that thrive on clarity: diamond, aquamarine, clear topaz. The namesake cut for emeralds.
Optical effect: "Hall of Mirrors" – deep, calm play of light. Maximum elegance and clarity.
Worse for: Stones with inclusions – the open cut shows everything.
Cushion Cut
What it is: Square or rectangular with rounded corners and large facets.
Best for: Colored stones (sapphire, ruby, amethyst) whose color glows intensely through the large facets.
Optical effect: Soft and romantic. Lots of fire, little sharpness.
Cabochon
What it is: No facets – the stone is polished smooth and domed.
Best for: Stones with special effects: moonstone (adularescence), opal (opalescence), tiger's eye (chatoyancy), labradorite (labradorescence), star sapphires.
Why: Facets would disrupt the internal light effect – cabochon maximizes it.
Effect: Organic, natural, mystical.
How to choose the right cut shape
- Does the stone have a special effect? → Cabochon
- Should the stone sparkle maximally? → Round brilliant
- Should the finger appear elongated? → Oval or marquise
- Should it appear elegant and sophisticated? → Emerald cut
- Is color intensity important? → Cushion or oval
Jewellery in different cuts at Corelune Jewellery
Brilliant, Oval, Emerald, Cabochon – at Corelune Jewellery you will find jewellery in all important cut shapes.
