11x17mm Tibetan Turquoise Teardrop. There are four major Turquoise mining regions in Tibet; the Turquoise in the above pendant has its origin in the mining area in the east of the country. Its blue-green colour is typical of Tibetan Turquoise. Tibetans have long treasured Turquoise, considering it to have spiritual qualities.
Turquoise is one of only two gemstones that are considered rocks, neither crystal nor organic, the other being the dark blue Lapis Lazuli, represented here in the two dark blue hexagonal beads at the connection  between the Silver chain and the 11x17mm Tibetan Turquoise pendant, and in the two smallish round deep blue examples at the rear near the clasp. The source of the Lapis Lazuli is the far north-east, high country region of Afghanistan.

Two other elements in this Sydney-created elegant necklace are 1. the old deep honey-orange Carnelian bead above the Turquoise, taken from a graduated strand of such barrel-cut AGrade Carnelians, from one of the tribes of Nagaland, mined and handcut in Gujerat in east India in the early 1900s specifically for trade with that Naga tribe far away on the other side of the sub-continent; and 2. the old gemstone quality orange-red Coral above the Carnelian, from Sth India.