I have absolutely no information about this necklace, and I do not know of which type of stones it is made. I regret that the neckline of the Duchess of Cornwall's dress does not enable us to have a good view of the necklace.
Here are two more watermark-free pictures (from Zimbio):
Caption: Camilla, Duchess of Cornwall visits Shams Al Ma'aref School on the ninth day of a tour of the Middle East on March 19, 2013 in Muscat, Oman. The Royal couple are on the fourth and final leg of a tour of the Middle East taking in Jordan, Qatar, Saudia Arabia and Oman (March 18, 2013 - Source: Chris Jackson/Getty Images Europe).
It might have been a gift of traditional Arabic jewellery - but this is pure speculation from me.
We can notice that the Duchess of Cornwall wore other items of traditional jewellery during this visit to the Middle-East:
Caption: Camilla, Duchess of Cornwall visits Nizwa Fort on the eighth day of a tour of the Middle East on March 18, 2013 in Nizwa, Oman. The Royal couple are on the fourth and final leg of a tour of the Middle East taking in Jordan, Qatar, Saudia Arabia and Oman (March 17, 2013 - Source: Chris Jackson/Getty Images Europe).
Caption: Camilla, Duchess of Cornwall tries some chocolates made by women who are learning cooking skills at the Bab Rizq Jameel Nafisa Shams Female Academy for Arts and Crafts on March 17, 2013 ,Jeddah, Saudi Arabia (March 16, 2013 - Source: Pool/Getty Images Europe).
Caption: Camilla, Duchess of Cornwall arrives at Riyadh Airbase on the fith day of a tour of the Middle East on March 15, 2013 in Riyahd, Saudi Arabia. The Royal couple are on the third leg of a tour of the Middle East taking in Qatar, Saudia Arabia and Oman (March 14, 2013 - Source: Chris Jackson/Getty Images Europe).
Caption: (left) Camilla, Duchess of Cornwall visits the Qatar Science and Technology Park on the fourth day of a tour of the Middle East on March 14, 2013 in Doha, Qatar. The Royal couple are on the second leg of a tour of the Middle East taking in Qatar, Saudia Arabia and Oman (March 13, 2013 - Source: Chris Jackson/Getty Images Europe). (right) Camilla, Duchess of Cornwall attends a 'Springboard' Women's self development program at the Four Seasons Hotel on the first day of a visit to the Qatar on March 14, 2013 in Doha, Qatar. The Royal couple are on the second leg of a tour of the Middle East taking in Qatar, Saudia Arabia and Oman (March 13, 2013 - Source: Chris Jackson/Getty Images Europe).
I am not sure that this bracelet can be labelled as "traditional", but it was a gift to Camilla, and she wore it!
Caption: A bracelet made from recycled paper is worn by Camilla, Duchess of Cornwall given to her as she visited Mahis School on the second day of a visit to the country on March 12, 2013 in Amman, Jordan. The Royal couple are on the first leg of a tour of the Middle East taking in Qatar, Saudia Arabia and Oman (March 11, 2013 - Source: Chris Jackson/Getty Images Europe).
on November 5, 2014, 5:05 am, in reply to "
