What does girdle thickness guideline indicate about proper girdle thickness?

• A. Thick enough to prevent chipping but not so thick that it detracts from appearance.
• B. Girdle thickness should be as thick as possible.
• C. Thickness has no impact on durability.
• D. Girdle thickness should equal table size.

Answer: (A)

Girdle thickness guidelines emphasize balancing durability with appearance. The girdle is the outer edge around the diamond’s widest part, and its thickness affects both how well the stone resists chips and how it looks. If the girdle is too thin, it’s more prone to chipping during setting or daily wear. If it’s too thick, it can visually widen the stone and interfere with light performance, making the diamond appear smaller or less brilliant and adding unnecessary weight. So the guideline aims for a thickness that’s just strong enough to prevent damage but not so thick that it detracts from appearance or light return.

The other ideas don’t fit because making the girdle as thick as possible would harm aesthetics and light performance, thickness clearly influences durability, and there’s no practical expectation that girdle thickness should match the table size.