According to Varahmihira the gold should be purchased while Sun is in Leo & should be sold after five months to gain more profit. Sign Mesha, planets Sun & Jupiter are the natural significators of gold.
International Gold Prices, like all other international events are regulated by the Prithvi Chakra (called "Padma Chakra" in Narapatijayacharyā, derived from the ancient divine text Ādi Yāmala Tantra) which is the Suryasiddhāntic Horoscope cast at the meridians of MeruParvata at the moment of Nirayana Mesha Samkrānti.
This Prithvi Chakra is to be used not only for Gold prices or rain forecasting only, but for everything possible through astrology.
The relative prices of currencies are regulated by the astrological conditions of different nations according to their placement in different houses on the same Prithvi Chart. These findings have been tested over many years of data.
Here, we are concerned only with Gold Prices. To begin with, we should analyze the annual gold price rise for entire Solar Year beginning with Nirayana Sun's entry into Mesha (Aries), now-a-days starting around Apr 14, just one fortnight after Financial Year.
