by Richard W. Wise
© 2009
Crystal Opal
It is always exciting to work with a world class gemstone In this case we began with a 12.15 carat crystal opal. The stone was found a Lightning Ridge and though this Australian field is known as the source of the he finest black opal, it produces crystal as well. Crystal is one of the accepted opal type descriptions. It means that the stone has a transparent rather than a white, gray or black body color (Secrets Of The Gem Trade, p.189). This stone measures 17 x 14mm with a lovely 9.5mm high dome. A high dome is desirable because it will concentrate create a sense of movement as the stone moves on the finger and provide a “CinemaScope” side view of the play-of -color. This tone exhibits a confetti like pattern of sapphire blue, orangy-red and a wonderful foresty, slightly bluish green that partners very well with fine tsavorite garnet. 
The Setting:
The design is that of a blossom opening to reveal the treasure hidden within. The soft petal like golden lips serve to present and protect the stone at the same time. Note the shape of the shank, we provide weight at the back to counterbalance the top-heavy center setting. Four tsavorites bezel set, one at the base of each of the four split petals.
Sketches were prepared and working closely with our client, we chose 18k royal yellow gold for the setting. Black opal, particularly those with a vivid display of primary h
ues; red-orange, blue, green, often look their best in 22k. There are no hard and fast rules to the setting of opal; each gem is individual with a distinct personality that must be carefully catered to. Design and construction by Michael Corneau.