. Precious stones, a popular account of their characters, occurrence and applications, with an introduction to their determination, for mineralogists, lapidaries, jewellers, etc. With an appendix on pearls and coral. Precious stones; Pearls; Corals. '252 SYSTEMATIC DESCRIPTION OF PRECIOUS STONES sapphire-blue colour—an extremely rare tint in diamonds—but also by a brilliant lustre and fine play of colours. Its existence has been known of since 1830, and it at one time formed part of the famous collection of precious stones of Henry Philip Hope, who bought it for ^18,000. It is a perfect brilli
. Precious stones, a popular account of their characters, occurrence and applications, with an introduction to their determination, for mineralogists, lapidaries, jewellers, etc. With an appendix on pearls and coral. Precious stones; Pearls; Corals. '252 SYSTEMATIC DESCRIPTION OF PRECIOUS STONES sapphire-blue colour—an extremely rare tint in diamonds—but also by a brilliant lustre and fine play of colours. Its existence has been known of since 1830, and it at one time formed part of the famous collection of precious stones of Henry Philip Hope, who bought it for ^18,000. It is a perfect brilliant weighing 44J carats. A beautiful blue, triangular brilliant of 67tV carats, and valued in 1791 at 3,000,000 francs, was preserved among the French crown jewels up to the year 1792, when it was stolen, together with the " Regent" and others. It had been cut from a rough stone,, weighing llSfV carats, brought from India by Tavernier for Louis XIV. There are substantial grounds for the suggestion that when this brilliant was stolen it was divided, and the portions re-cut and placed on the market about 1830 in a new form. It is very possible that the " Hope Blue" diamond is one of these portions; another being a stone of 13| carats of the same blue colour, and formerly in the possession of Duke Karl of Brunswick, who sold it in 1874- in Geneva for 17,000 francs; the third portion may be identical with a stone of 1^ carats of the same colour, once bought for ^"300 and now in the possession of an English family. The Dresden Green diamond, preserved in the " Green Vaults " of Dresden, is the most famous representative of stones of this colour. It is of a very fine clear apple-green,, intermediate between the colour of emerald and chrysoprase, perfectly transparent and faultless in every way. It is almond-shaped in form, being l^i^^ inches long and f inch thick,, and weighs 40 carats, not, as is sometimes stated, 31J or 48 carats. Since 1743 i
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