18 Karat White Gold, Green Opal and Diamond Ring and Earrings, Sifen Chang

The ring centered by a cabochon green opal weighing 33.36 carats, within foliate surrounds set with round diamonds weighing 1.05 carats, size 6, with Chinese characters for Sifen Chang; the earrings of similar design set with two cabochon green opals weighing 8.30 carats and 8.04 carats, accented by round diamonds weighing 1.85 carats, with Chinese characters for Sifen Chang. With two signed boxes.

In very good condition. The green opals are medium light translucent green. One of the cabochons set in the earclips is slightly crazed and the other has some dark pitting. The diamonds are approximately G-I color, VVS-VS clarity. Accompanied by three Gübelin reports: No. 12011020 stating that the 33.36 carat opal is Natural, with no indications of color enhancement, no. 12011018 stating that the 8.30 carat opal is Natural, with no indications of color enhancement and no. 12011019 stating that the 8.04 carat opal is Natural, with no indications of color enhancement. Green opal, or prase opal as it is sometimes known, is a rare type of fine bluish green translucent non-phenomenal opal which is colored by the mineral copper. Green opal has been mined from Iyobo Mountain in Tanzania for approximately 20 years, and has also been mined in limited quantities in Poland, Russia and Napa, California. Large, evenly colored stones such as the ones utilized in this demi-parure of jewelry are extremely rare and coveted by gem collectors.
In response to your inquiry, we are pleased to provide you with a general report of the condition of the property described above. Since we are not professional conservators or restorers, we urge you to consult with a restorer or conservator of your choice who will be better able to provide a detailed, professional report. Prospective buyers should inspect each lot to satisfy themselves as to condition and must understand that any statement made by Sotheby's is merely a subjective qualified opinion. Illustrations in the catalogue may not be actual size. Prospective purchasers are reminded that, unless the catalogue description specifically states that a stone is natural, we have assumed that some form of treatment may have been used and that such treatment may not be permanent. Our presale estimates reflect this assumption.
NOTWITHSTANDING THIS REPORT OR ANY DISCUSSIONS CONCERNING CONDITION OF A LOT, ALL LOTS ARE OFFERED AND SOLD "AS IS" IN ACCORDANCE WITH THE CONDITIONS OF SALE PRINTED IN THE CATALOGUE.

Accompanied by three Gübelin reports:
No. 12011020 stating that the 33.36 carat opal is Natural, with no indications of color enhancement.
No. 12011018 stating that the 8.30 carat opal is Natural, with no indications of color enhancement.
No. 12011019 stating that the 8.04 carat opal is Natural, with no indications of color enhancement.