Natural Diamond Crystals

Photo: E. Skalwold 13 Natural Diamond Crystals from 3.18 to 0.05 cts. Benjamin Silliman, Jr. (1816 – 1885) Collection, Cornell University (original label) Professor of Chemistry, Yale University Curator of Yale's mineral collection following his brother-in-law, James Dwight Dana and his father, Benjamin Silliman, Sr. (for whom sillimanite is named). (The first official mineral curator at the Peabody was George Jarvis Brush in 1866).

Photo: E. Skalwold Carat Weights

Photo: E. Skalwold View with UVLW pen light. Most of what is seen here is just reflection from the light. The largest xtl actually fluoresces moderate yellow; green xtl: weak green; frosted white and pink xtls: strong bluish white and small xtl in right front and two in left rear: weak yellow. All others: inert.

Photo: E. Skalwold The 5 Larger Crystals Left to Right Back: 3.18 ct and 0.58 ct Front: 0.24 ct, 0.63 ct and 0.30 ct

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