Loose Diamond Definitions: L

Laser Drill Hole-A tiny tube made by a laser. The surface opening may resemble a pit, while the tube usually looks needle like. May be noticeable on treated Diamonds.

Light Yellow-A trade term used by some dealers to cover a wide range of colors in the low end of the diamond color-grading scale. Stones in the broad classification show a very obvious yellow tint to the unaided eye.

Lot-A group of rough diamonds offered for sale by the Diamond Trading Co. to firms invited to view its "sights." A lot usually includes a wide variety of material.

Loupe-Magnifying glass usually of 10X.

Luster-The quality of reflected and refracted light from the surface of a gemstone or pearl.

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