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Knowledge of diamond and the origin of its many connotations starts in India, where it was first mined. The word most generally used for diamond in Sanskrit is translitereated as vajra, "thunderbolt," and indrayudha, "Indra's weapon." Because Indra is the warrior god from Vedic scriptures, the foundation of Hinduism, the thunderbolt symbol indicates much about the Indian conception of diamond.

Rings date back several millennia, but ones given as tokens of love are first noted by the comic Roman poet Plautus in the 2nd century BCE. Wedding rings are known because of interior inscriptions recording the marriage contracts signed in the presence of the Emperor's image.

Writings: The earliest known reference to diamond is a Sanskrit manuscript, the Arthasastra ("The Lesson of Profit") by Kautiliya, a minister to Chandragupta of the Mauryan dynasty in northern India. The work is dated from 320-296 before the Common Era (BCE). The "Ratnapariksa" of Buddha Bhatta is a 6th-century text on gems. The manuscript summarizes Indian knowledge about diamond, which it introduces through an origin myth -- a window into the culture's cosmology and values. Buddha Bhatta describes the hierarchy of diamonds, their powers and virtues, and their distribution among the castes.

Kautiliya states "(a diamond that is) big, heavy, capable of bearing blows, with symmetrical points, capable of scratching (from the inside) a (glass) vessel (filled with water), revolving like a spindle and brilliantly shining is excellent. That (diamond) with points lost, without edges and defective on one side is bad." Indians recognized the qualities of a fine diamond octahedron and valued it.

Archaeology: No diamonds have been found in ancient sites, but holes in ancient beads show diamond's "footprint," cylindrical holes with conspicuous concentric grooves left by a twin-diamond drill. The holes are unlike the marks of any other modern or ancient drilling technique -- a signature of this diamond technology. Beads from sites in Sri Lanka, India, Thailand, Yemen and Egypt show the marks of diamond drills prior to 700 CE and as early as the 4th century BCE in Yemen.