Quality Assurance Benchmarks highlight workmanship of semi-finished and finished jewelry. Learn how to evaluate the quality of a pear-shaped stone set in a five-prong platinum setting.

Perspective view illustration of a pear-shaped center stone set in a five-prong platinum setting.

40% of prong metal is removed at the bearing.

Prongs are evenly and consistently shaped.

There is no damage to the stone.

The stone is seated perpendicular and square to the setting.

Close-up side view illustration of a pear-shaped center stone set in a five-prong platinum setting.

There are no tool marks inside the setting or around the prongs.

The setting has a gallery wire between the tops of the prongs and the base of the setting.

The stone is level.

Side view illustration of a pear-shaped center stone set in a five-prong platinum setting.

Prong contact is between 40 and 50%.

Prong height is 100%.

There are no gaps at the bearing above or below the girdle.

There are no tool marks inside the setting or around the prongs.

The setting has a gallery wire between the tops of the prongs and the base of the setting.

The stone is level.

Potential Problems and Engineering Features

The bearing is not properly fitted to the shape of the stone, leaving visible gaps which will cause loosening over time.

Close-up illustration of a round prong with a gap between the bearing and the crown of the stone.

Both the round and v-prongs show bearings that are not fitted to the stone, leaving visible gaps.

The edges of the v-prong must conform to the stone.

Close-up illustration of a v-prongs that is raised up above the stone.

Edges of the v-prong are raised up and will snag on clothing. Once snagged, they could pull back and loosen the stone.

How-to Video

Setting a Pear-Shaped Stone in Platinum Prongs

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