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Reference stones from the laboratory archive. Names and notes are for species recognition; they are not a substitute for a numbered GRA report.

AQUAMARINE

Aquamarine's name comes from the Latin for seawater.

Kunzite is the best-known variety of the mineral spodumene.

Often described as emerald by day, ruby by night.

Citrine is rare in nature.

The ancient Egyptians mined peridot on the Red Sea island of Zabargad.

Gem experts differ on the degree of green that makes one stone an emerald.

Colored diamonds are valued for hue, tone and saturation.

Diamond forms under high temperature and pressure conditions.