18 HINTS FOR OFFICERS IN THE DETECTION OF PRECIOUS STONES. 
(uwarowite and bobrowska); hiddenite; oriental emerald; peridot; spinel ; 
topaz; tourmaline ; zircon (jargoon). 
VIOLET. 
Avinite ; garnet; quartz (amethyst); oriental amethyst. 
Note.—The stones in italic are very rare, and little used in jewellery. 
TABLE II. 
CoMPARATIVE HarpDNESS oF PRECIOUS STONES. 
IDreimomngl 5g ton UD) 
Sap Pie waa. 1 cos ehnMe 
(Ruby, oriental emerald, 
Other corundums... 8°9... = oriental topaz, oriental 
amethyst). 
(Of great value if ‘ cha- 
Chrysoberyl ... ... 8°5 .. toyant,” or showing a 
* cat’s eye’). 
Spinel ... 
Topaz 
Phenakite , 
Beryl and emerald 
TUEOD 55 900 300 
Uwarowite, garnet 
Garnet. 
Euclase... 
Tolite o 
Essonite, garnet ... 
Quartz ... 
Spodumene ... 
Hiddenite 
Peridot ... 
Jade 
Epidote... 
Moonstone 
INS OUTIU soq EN Sad 
Bobrowska garnet 
Turquoise 
Felspar ... 
Diopside 
Opal 
Anatase 
Sphene ... 
Lapis lazuli ... 
ANEW n05 au 
Apophyllite ... 
oo 
5 ows 
or OT 
(Beryl generally hardest). 
(Jacinth and jargoon). 
(May reach 8). 
(Almandine, pyrope, &c). 
Ww or oro oad st 
: 22: 
... (Cinnamon stone). 
(Rock crystal, amethyst, 
&e.). 
° 
° 
CO OF OF 2 
ot 
+ 
jo) 
lor) 
oT 
ot 
i) 
oT 
~4 
or 
OW OT OF OT OT OID DH DDD OP OI ma SRNR HOO DO 
e~ or co x 
Calllemomtie 55 ove quoise. Penknife 
(Often taken for tur- 
ier scratches it easily). 
