Jewel__A_Celebration_of_Earth_s_Treasures
019 Pyramidal crystal form Acicular crystal form Botyroidal crystal form Prismatic crystal form Dendritic crystal form Massive c ...
020 INTRODUCTION Synthetic gems are identical to natural minerals physically, chemically, and optically, but are made in a labor ...
WHAT IS A GEM? 021 How qualities add up Value, quality, and different varieties Gems are defined by the very qualities that give ...
022 Visual properties How a gem interacts with light is the very essence of its nature. Light is the source of a gemstone’s beau ...
023 Colour Lustre Refractive index Spectroscopy A gem’s lustre is the general appearance of its surface in reflected light. Ther ...
024 INTRODUCTION Emerald Agate Amazonite Chalcedony Chrysoberyl Diamond Emerald Garnet Kunzite Opal Precious beryl Quartz Sodali ...
WHERE DO GEMS COME FROM? 025 Australia In its heyday, Australia produced the largest amount of precious opals – around 95 per ce ...
026 INTRODUCTION Facets conceal imperfect interior Internal flaws and inclusions Fine colouring Skilled faceting Non-gemmy mater ...
027 Only around 30 per cent of diamonds mined worldwide are classified as being of gem quality GRADING AND EVALUATION Gemstones ...
028 INTRODUCTION Gem cuts Stones are reshaped to enhance their beauty and to increase their value. A finished gem can be many ti ...
GEM CUTS 029 Brilliant cuts maximize brilliance. They are also used on coloured stones to deepen their colour, conceal imperfect ...
030 INTRODUCTION The value of a gem Whether they are collectable specimens, used in everyday jewellery, or incorporated into bea ...
THE VALUE OF A GEM 031 Many gemstones undergo treatment to enhance their natural characteristics in addition to the standard cut ...
032 INTRODUCTION What is a jewel? A jewel is a precious stone, usually a single crystal or part of a hard, lustrous or transluce ...
WHAT IS A JEWEL? 033 Byzantine brooch This 6th-century CE brooch in the form of a Greek cross displays the Byzantine love of gol ...
Native elements 034-035_Native_Elements_Opener.indd 34 19/05/2016 14:33 ...
Native elements 034-035_Native_Elements_Opener.indd 35 19/05/2016 14:33 ...
036 NATIVE ELEMENTS Gold wings Gold? Yel low, glittering, precious gold? This yellow slave will knit and break religions, bless ...
GOLD 037 Gold △ Crystalline gold, made up of of octahedral gold crystals E ven before gold became the trading medium of the comm ...
038 NATIVE ELEMENTS Cartier pen | Three views of this 2008 limited-edition Cartier gold pen show its dragon motif, set with 522 ...
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