Gem Diamonds leads the risers after announcing subsidiary Kimberley Diamonds has entered into an agreement to sell yellow diamonds from the Ellendale mine in Western Australia to Laurelton Diamonds, which is owned by the US jeweller Tiffany.Taylor Wimpey is lifted by an upgrade from Goldman Sachs. The housebuilding sector has underperformed the market by around a quarter in the last three months, leaving the company looking cheap. The US bank has upgraded Taylor Wimpey from 'neutral' to 'buy.'Sub-prime lender Provident Financial said on Friday it expects no material improvement in the rate of increase in unemployment until next Spring and will maintain a cautious approach to new lending will remain in place at least until then. But the shares have been going well and the company.FTSE 250 - RisersGem Diamonds (GEMD) 208.80p +5.51%Murray International Trust (MYI) 755.50p +4.93%Morgan Crucible (MGCR) 158.00p +4.64%Lamprell (LAM) 181.30p +4.26%TR Property Inv Trust Sigma Shares (TRYS) 61.50p +4.06%Provident Financial (PFG) 969.00p +3.69%Taylor Wimpey (TW.) 35.58p +3.61%Brewin Dolphin (BRW) 145.90p +3.55%Rotork (ROR) 1,198.00p +3.45%Caledonia Investments (CLDN) 1,570.00p +3.36%FTSE 250 - FallersHalma (HLMA) 240.90p -3.21%BSS Group (BTSM) 231.60p -3.02%Trinity Mirror (TNI) 140.70p -2.56%Hochschild Mining (HOC) 315.80p -2.23%Carpetright (CPR) 919.00p -2.23%Melrose Resources (MRS) 293.00p -2.04%COLT Telecom Group S.A. (COLT) 132.40p -1.78%Brown (N.) Group (BWNG) 247.90p -1.59%Domino's Pizza UK & IRL (DOM) 294.20p -1.57%Mitchells & Butlers (MAB) 253.10p -1.52%