The selected image shows a slim, 925 silver bangle or bracelet featuring a row of dark or black pavé-set stones.

Based on the clear stamps inside the bracelet, here is what each mark signifies:

• 925: This is the standard hallmark for sterling silver, confirming that the metal composition is 92.5% pure silver mixed with 7.5% other metal alloys (usually copper) for durability.

• TJC: This is the maker's mark or sponsor mark for TJC (The Jewellery Channel), a well-known UK-based home shopping network and online jewelry retailer. They design and manufacture their own vertically integrated lines of gemstone and fine metal jewelry. 

The close-up image reveals that the bracelet is designed with a channel setting or shared-prong framework holding a continuous line of faceted round black gemstones. 

Given that the bracelet is hallmarked TJC and 925 sterling silver, these stones are highly likely to be one of the following:

• Black Spinel: This is by far the most common gemstone used by TJC for this specific look. Black spinel is a natural, highly reflective semi-precious stone known for its brilliant, mirror-like metallic luster and jet-black finish. 

• Black Diamonds: Alternatively, TJC frequently produces line and tennis bracelets featuring treated natural black diamonds. They share a very similar dark, faceted sparkle but carry a higher price point

• If Black Spinel (Most Likely): The estimated retail value ranges between $30 and $70. Black spinel is a beautiful but abundant semi-precious stone. On shopping networks like TJC, standard-weight sterling silver spinel line bracelets or bangles typically sell brand new within this bracket.

• If Black Diamond: The estimated retail value ranges between $120 and $250. While natural diamonds, black diamonds require color treatment to achieve their uniform pitch-black color, which keeps them relatively budget-friendly when set in sterling silver rather than gold.