a diamond

Science Science 7 of 7 appearances
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"a diamond" appearances by year

84
1
89
1
2
1
94
99
04
09
1
14
19
1
24

All Science clues by year

37
84
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89
75
94
59
99
80
04
137
09
69
14
128
19
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24
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# Clue Answer As Given Value Round Category Air Date Show
The Vickers test measures the hardness of a metal by indenting it with one of these super-hard gems a diamond $400 DJ HARD SCIENCE 2021-04-26 #8386
At 10, this mineral is the hardest on the Mohs scale diamond $400 DJ SCIENCE IS A 7-LETTER WORD 2013-04-29 #6596
Carbonado is an impure form of this mineral used for drills & abrasives diamond $200 DJ SCIENCE 1992-02-21 #1730
Bort, an impure type of this form of carbon, is used for cutting, not for jewelry diamond $400 DJ SCIENCE 1991-05-06 #1551
Heat one of these to 1,500 degrees centigrade in an inert atmosphere & it reverts to graphite a diamond $400 DJ SCIENCE 1991-04-18 #1539
This mineral comes after No. 9, corundum, on the Mohs scale Diamond $800 DJ SCIENCE 1990-02-01 #1254
At 15 on the modified Mohs' scale, this substance still has the highest hardness number a diamond $300 J PHYSICAL SCIENCE 1988-01-11 #776
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