No stone is so much in request for seals as carnelian. It is likewise cut into beads for necklaces, and stones for ear─rings; into crosses, bracelets, and other trinkets, which, in India, form a considerable branch of traffic. The amount of the sale value of different kinds of carnelian goods vended by the East India Company in 1807, was 11,187_l._: but, in other years, it has not usually been so much as half that sum. Formerly carnelians were exported from Japan to Holland; and thence were carried to Oberstein, in France, to be exchanged for the agates of that country, which were exported to China. The carnelian was much esteemed by the ancients; and many fine engraved carnelians are preserved in different collections. 94. _CHRYSOPRASE, an extremely hard kind of stone, of clear and delicate apple─green colour, is considered to be a kind of calcedony._ This beautiful mineral has hitherto been found only in the vicinity of Kosemitz, and in a few other parts of Lower Silesia. It is susceptible of a high polish, and is much prized by jewellers when its colour is deep and pure. Its colour, however, is so fugitive, that, if kept in a warm and dry situation, it loses the greatest part of it; and if exposed to moisture it becomes much altered. Lapidaries assert, that great care ought to be taken in the polishing of it;—pretending that if, from want of sufficient moisture, or by the too rapid motion of the wheel, it be over─heated, it will become whitish or turbid. Chrysoprase is generally cut into a convex form, or what jewellers call _en cabochon_; and is set with green taffeta beneath it, as foil. It is used for ring stones, brooches, and other ornaments; and is found to harmonize well with diamonds and pearls. The larger and more impure masses are cut into snuff─boxes, seal stones, and similar articles. Some of the finest specimens of chrysoprase that are known, are to be seen in the cathedral church of Prague, where a small closet is inlaid with them. Imitations of chrysoprase are sometimes imposed upon the public; but these are easily known by persons who are acquainted with the nature of precious stones. 95. _BLOODSTONE, or HELIOTROPE, is an opaque stone of the quartz family, generally of dark green colour, with a somewhat bluish cast, and marked with blood─red spots or stripes._ _It usually occurs in masses of irregular form; and, when cut thin, is sometimes translucent at the edges._