spinel

He would often spend a whole day settling and resettling in their cases the various stones that be had collected, such as the olive-green chrysoberyl that turns red by lamplight, the cymophane with its wirelike line of silver, the pistachio-coloured peridot, rose-pink and wine-yellow topazes, carbuncles of fiery scarlet with tremulous, four-rayed stars, flame-red cinnamon-stones, orange and violet spinels, and amethysts with their alternate layers of ruby and sapphire.

Melting furnaces 1 and 2 rendered fundamentally [Al.sub.4][C.sub.3], MgO, and spinels. The stack melter rendered principally [Al.sub.2][O.sub.3] and spinels.

This year, there's a wide selection of pieces: In sterling silver; rose gold and vermeil sterling silver with multicolored sapphires, spinels, rubies and freshwater cultivated pearls; 18-carat yellow gold with diamonds and an XXS version in 18-carat white gold with diamonds.

It is also confirmed that the chromium oxides have been reacted with the iron and nickel to form spinels in the form of Nichromite and Chromite.

Tourmalines, diamonds, rubies and spinels translate ancient weaponry into wearable swords and daggers more fit for fashion than battle.

Combinations of vivid gems--sapphires, spinels, diamonds, garnets, and onyx--give each piece its distinguished allure, just like the colored wings of their counterparts in the wild.

In a second talk, Dr Krzemnicki described items studied recently in SSEF's laboratory, such as sapphires from basaltic deposits in Nigeria, low-temperature heated rubies from Mozambique, heated red spinels from Tanzania, a hydrothermal synthetic emerald weighing 67 ct, a star spessartine from Nigeria, and the effect of chemical alteration on conch pearls.

The 46mm skull shaped dial is uniquely lined with black PVD applique and black SLN X set which comprises 229 black spinels. The back case adorns an engraved medallion which says "Black Magic Dia de Los Muertos for Mistal with engraved limited edition numbers".

Finding oxidized iron on the spinels led the team to hypothesize that, at low temperatures, the conductive spinels were helping facilitate the exchange of electrons between reduced iron and water, a process that is necessary for the iron to split the water molecules and create the hydrogen gas.

The jewels include emeralds, sapphires, rubies, the purest diamonds, delicate purple jade, sumptuous spinels and spectacular white, blue or black opals with gorgeous highlights.